Start with the phone you use. If it’s an iPhone, choose an Apple Watch: Samsung’s current Galaxy Watch9 and Galaxy Watch Ultra2 do not support iOS. If you use Android, the Galaxy Watch9 is Samsung’s everyday option, while the larger Ultra2 is aimed at demanding outdoor and sport use. Some Samsung health features require a compatible Galaxy phone, even when the watch can pair with another Android phone.
Check phone compatibility first
The phone is the deciding factor, not a small feature difference. Apple Watch is built around iPhone; current Galaxy watches require Android and exclude iPhone.
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| Watch | Phone and software requirement | What to know |
|---|---|---|
| Apple Watch Series 12 and Ultra 4 | iPhone 11 or later; iOS 27 or later; watchOS 27 or later | Apple’s compatibility table, published September 17, 2026, lists these requirements. Check Apple’s model-by-model compatibility table. |
| Apple Watch Series 11, SE 3, and Ultra 3 | iPhone 11 or later; iOS 26 or later; watchOS 26 or later | These previous-generation models have different minimum software requirements; verify the exact model row before buying. Apple compatibility table. |
| Samsung Galaxy Watch9 and Galaxy Watch Ultra2 | Android 13.0 or higher and at least 1.5 GB RAM | Samsung says these models do not support iOS. Some phone models may still be incompatible despite meeting the listed minimums. Samsung compatibility information. |
Using a non-Samsung Android phone?
Recent Galaxy watches can pair with Android phones from other manufacturers, subject to compatibility. Pairing does not mean every feature is available: Samsung says some personalized health insights, Galaxy AI health features such as Running Coach, and Samsung Health Monitor features require a compatible Galaxy phone. The listed Health Monitor features include ECG, Irregular Heart Rhythm Notification, and Sleep Apnea. Eligibility and availability can vary by feature and region. Samsung’s compatibility announcement explains the distinction.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhich current models are the real comparison?
Apple Watch Series 12: the mainstream iPhone choice
Series 12 is the current Apple reference for this comparison. Apple presents Watch as an iPhone companion: for example, you can create a custom route in Maps on iPhone and download it to Watch, or see cycling metrics on iPhone as a Live Activity. Those connected features are most relevant if you already use an iPhone. See Apple’s Watch overview.
#1 Best Overall
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Galaxy Watch9: Samsung’s everyday Android option
Samsung positions Galaxy Watch9 for everyday health management and offers 40 mm and 44 mm case sizes. Its Samsung Health features are grouped around Activity, Mindfulness, Nutrition, Sleep, and Vitals. Samsung describes overnight measurements that use heart rate, heart-rate variability, respiratory rate, skin temperature, and blood oxygen saturation to build a personalized baseline. These are wellness features and measurements, not a clinical diagnosis or proof of greater accuracy than Apple Watch. Samsung’s product overview.
Galaxy Watch Ultra2: for a larger, more specialized watch
Samsung positions Ultra2 for high-intensity sports and outdoor activity. The company lists a 47 mm case, an 800 mAh battery, display brightness up to 5,000 nits, Trail Run information, and water- and dive-related features. These specifications and features describe the product’s intended use; they do not establish real-world GPS accuracy, endurance, or safety superiority. Its size and specialized positioning make it a less direct rival to a mainstream Apple Watch than Galaxy Watch9. Samsung’s product overview.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Compare the things that affect your choice
Phone integration
Choose Apple Watch if you want a watch that works with iPhone features and Apple’s connected services. Choose Galaxy Watch if you use Android; a Galaxy phone is the better fit if you want access to the full set of Samsung health and ecosystem features described for the watch. Neither current Galaxy model is an option for an iPhone owner, and Apple Watch is not an Android watch.
Size and use
Galaxy Watch9 comes in 40 mm and 44 mm sizes for an everyday-use focus. Ultra2 is 47 mm and is designed for buyers prioritizing outdoor and high-intensity sport features. Compare the actual case size and intended use rather than treating every model from one brand as interchangeable.
Rank #3
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Battery claims are not a cross-brand runtime test
Samsung reports a 390 mAh battery for Galaxy Watch9 and says that is 20% more capacity than previous generations. It reports 800 mAh for Ultra2. Capacity is not the same as time between charges, and these figures do not establish that either Galaxy watch lasts longer than a particular Apple Watch. The cited manufacturer information does not provide a controlled, like-for-like cross-brand battery test.
Health features need careful interpretation
Both product families offer health and fitness features, but a list of sensors or metrics is not evidence that one watch measures more accurately. Samsung’s feature access may depend on a compatible Galaxy phone, eligibility, and region. Treat watch readings and scores as consumer wellness information rather than a substitute for medical advice or diagnosis.
Rank #4
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Blue/Bright Blue Trail Loop - M/L. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/51SKumOyv8L._SL160_.jpg)
- RUGGED AND READY TO GO—The ultimate sports and adventure smartwatch is built to last with an extremely tough titanium case and a strong sapphire crystal display. Water resistant up to 100m—it’s great for swimmers, divers, and fans of high-speed water sports.*
- A FULL-FEATURED HEALTH TRACKER—Ultra 3 can take an ECG* and check your heart rhythm for signs of AFib—right from your wrist. The smartwatch sends alerts for possible hypertension,* an irregular heart rhythm,* or an unusually high or low heart rate. You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and take readings of your blood oxygen.*
- ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for marathoners, triathletes, mountain bikers, backcountry hikers, and mountain climbers, Ultra 3 provides precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, running power, Workout Buddy powered by Apple Intelligence from your nearby iPhone,* training load, and more.
- KEEP HELP CLOSE AT HAND—Ultra 3 is a smartwatch that can detect a hard fall or severe car crash* and automatically help connect you to emergency services and notify your emergency contacts. Check In can automatically notify a loved one when you’ve arrived at your destination.
- MULTIDAY BATTERY LIFE—Ultra 3 is a smartwatch that’s engineered to give you even longer battery life. It’s perfect for trail runners—with up to 42 hours of normal use and up to 72 hours in Low Power Mode.* Track a workout with full GPS and heart rate monitoring for up to 20 hours in Low Power Mode.*
Price and value depend on the exact offer
No current, like-for-like regional price comparison is established here. Check live prices for the specific case size, connectivity configuration, retailer, and region you plan to buy in; promotions and availability can change. Also check carrier support if you are considering a cellular configuration.
Quick Recap
Which smartwatch should you buy?
- Choose Apple Watch Series 12 if you have a compatible iPhone and want Apple’s iPhone-connected experience.
- Choose Galaxy Watch9 if you use Android and want Samsung’s everyday health and activity watch; check whether any features you care about need a Galaxy phone.
- Consider Galaxy Watch Ultra2 if you use Android, want a 47 mm watch, and value Samsung’s stated outdoor and high-intensity sport focus.
- Before paying, verify the exact watch and phone compatibility, required OS versions, regional health-feature availability, and current price for your configuration.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
