For most people this choice is made by the phone in their pocket. No Apple Watch pairs with an Android phone, and Samsung lists Android 13 or newer as the requirement for the Galaxy Watch9, with no mention of iPhone. If you are happy with your phone, buy the watch built for it. The rest of this page is for people choosing a phone and watch together, or who want to know what they gain or give up, use by use.

The current models are the Apple Watch Series 12 (on sale since 18 September 2026) and the Samsung Galaxy Watch9 (on sale since 7 August 2026). An earlier version of this page compared the Series 9 and Galaxy Watch6; both have been replaced three times since.

How this comparison is compiled. Every figure comes from Apple’s or Samsung’s own product page, specification page or press release, checked on 11 October 2026. Battery figures are each maker’s claim under its own test conditions, and the two companies do not test the same way, so treat cross-brand battery gaps as approximate. We have not lab-tested either watch, and nothing here is a measured result.

Apple Watch Series 12 vs Galaxy Watch9 at a glance

Check Apple Watch Series 12 prices on Amazon · Check Galaxy Watch9 prices on Amazon

Which is better for everyday use?

Short answer: the one that matches your phone. On paper the Galaxy Watch9 has the brighter screen and the longer battery claim; the Series 12 has the faster top-up.

Day to day, both do the same core jobs: notifications, calls, an always-on display, and a voice assistant. The published differences are these:

• Screen. Samsung rates the Watch9’s sapphire crystal display at up to 3,000 nits. Apple rates the Series 12 at up to 2,000 nits. Both are bright enough to be sold as readable in sunlight; the Samsung figure is higher.
• Battery between charges. Apple claims up to 24 hours of normal use. Samsung claims up to 30 hours with the always-on display on. Both are charge-every-day watches.
• Topping up. Apple says 15 minutes on the charger adds up to 12 hours. Samsung says the 40 mm Watch9 reaches 50% in 30 minutes.
• Assistant. The Watch9 runs Google Gemini and answers when you raise your wrist, with no wake word. Samsung’s own footnote warns the gesture can trigger by accident. Siri AI on the Series 12 is a beta, in English first.
• Toughness. Samsung lists MIL-STD-810H alongside 5 ATM and IP68. Apple lists 50 m water resistance, IP6X dust resistance, and Ceramic Shield 2 glass on aluminum models.

Which is better for running?

Short answer: the Series 12 has the better-documented running tools. For marathons and longer, neither base watch is the right pick.

Apple publishes a workout battery figure for the Series 12: up to 10 hours of workout tracking, tested on outdoor runs with heart rate on and no iPhone nearby. Its running features include Pacer, Race Route (racing your own past time on a route), automatic track detection, and custom workouts with warm-up and recovery intervals. Workout Buddy gives spoken updates on pace and distance, and needs Bluetooth headphones and an Apple Intelligence-capable iPhone. Apple lists L1 GPS for the Series 12, not dual-frequency.

Samsung offers Running Coach, a three to five week program for new and experienced runners, plus Daily Cardio Load and a Fitness Index that includes VO2 max. Samsung does not publish a GPS workout battery figure for the Watch9, and its US pages do not confirm dual-frequency GPS for the Watch9; in Samsung’s launch table that row is filled in for the Galaxy Watch Ultra2 only.

If you run long, look one step up in either family. The Apple Watch Ultra 4 ($799) lists up to 18 hours of workout tracking. The Galaxy Watch Ultra2 ($699.99) lists L1+L5 dual-frequency GPS.

Which is better for fitness tracking?

Short answer: the Galaxy Watch9 measures more kinds of things; the Series 12 samples heart rate more often. Pick by which data you will use.

• Apple Watch has no body composition measurement.
• Apple Watch Series 12. A new optical heart rate sensor that takes background readings every five seconds and heart rate variability readings as often as every five minutes, a daily Readiness score built from activity, vitals and sleep, and a step count on the watch face. Apple describes its heart rate sensing as the most accurate in a wearable, citing its own study.

Samsung labels Energy Score, Vitals and body composition as wellness features, not medical ones. Apple says the same about Vitals, blood oxygen and temperature.

Which has the better battery life?

Short answer: the Galaxy Watch9’s claim is longer (30 hours against 24), but both need charging daily, and the two claims are not measured the same way.

If you want several days between charges and you are not tied to either brand’s features, neither of these is the right family. The Garmin Venu 4 lists up to 12 days and the Amazfit Balance 3 lists 21 days; both work with iPhone and Android. Our smartwatch comparison has those figures side by side.

Which is better for sleep tracking?

Short answer: close. Both score your sleep and both watch for signs of sleep apnea. Samsung adds coaching; Apple’s apnea feature covers younger adults.

• Apple Watch Series 12. A nightly sleep score based on duration, bedtime consistency, awakenings and time in each sleep stage. Sleep apnea notifications are intended to detect signs of moderate to severe sleep apnea in people aged 18 and over who have not been diagnosed. Overnight vitals include heart rate variability, and the watch has a temperature sensor.
• Samsung Galaxy Watch9. Sleep apnea risk detection, which Samsung describes as FDA-cleared, for ages 22 and over, needing at least two days of data within ten days. Bedtime Guidance suggests when to go to bed after three nights of tracking, and Sleep Coaching is a three to four week program. Energy Score rolls sleep into a daily number.

One practical point: a watch that needs charging every day has to be charged at some time other than night if you want sleep data. Apple’s 15-minute top-up claim and Samsung’s 30-minute half-charge claim are the figures that matter for that routine.

Health features compared

Neither watch is a medical device for diagnosis, and both makers say so in their footnotes. Samsung also notes that its Heart Health Score needs a Samsung Galaxy phone, so if you pair a Watch9 with another Android brand, check Samsung’s feature notes before you buy.

Price: what each family costs

These are list prices. Both brands’ previous generations are often discounted after a launch; check that the model in a deal is the one you mean, because retailer listings for “Apple Watch” and “Galaxy Watch” mix generations.

The verdict, by reader

• You have an iPhone: Apple Watch Series 12, or the SE 3 if you do not need ECG or blood oxygen.
• You have a Samsung Galaxy phone: Galaxy Watch9. You also get Heart Health Score, which Samsung restricts to its own phones.
• You have another Android phone: the Watch9 works with Android 13 or newer, but compare it with the Google Pixel Watch 5 first.
• You run long distances or want multi-day battery: Apple Watch Ultra 4 or Galaxy Watch Ultra2, or a Garmin.
• You are choosing a phone and watch together: decide on the phone first. The watch differences on this page are smaller than the differences between iOS and Android.

Frequently asked questions

Can you use an Apple Watch with an Android phone?

No. Apple lists an iPhone 11 or later with iOS 27 or later as the requirement for the Series 12, the SE 3 and the Ultra 4.

Can you use a Galaxy Watch9 with an iPhone?

Samsung lists Android 13 or newer as the requirement and does not mention iPhone support on its Watch9 pages.

Which lasts longer on a charge, Apple Watch or Galaxy Watch?

By the makers’ own claims, the Galaxy Watch9 (up to 30 hours with the always-on display on) outlasts the Apple Watch Series 12 (up to 24 hours of normal use). The tests differ, so the real gap may be smaller or larger. Both are daily-charge watches.

Which is more accurate for heart rate?

There is no like-for-like published figure. Apple says the Series 12 has the most accurate heart rate sensing in a wearable, based on its own study. We have not tested either watch and do not rank them on accuracy.

Is the Galaxy Watch9 or the Apple Watch Series 12 cheaper?

The Galaxy Watch9 starts $19 lower: $379.99 against $399. With cellular, the Watch9 starts at $429.99. The cheapest current Apple Watch is the SE 3 at $249.

Sources

• Apple, Apple Watch Series 12 product and specifications pages: apple.com/apple-watch-series-12 and specs
• Samsung US Newsroom, Galaxy Watch Ultra2 and Watch9 launch release with specification table, 22 July 2026: news.samsung.com
• Samsung, Galaxy Watch9 product page: samsung.com/us/watches/galaxy-watch9
• Apple Watch Ultra 4, Apple Watch SE 3 and Galaxy Watch Ultra2 figures: the makers’ specification pages, as listed in our smartwatch comparison.

Checked 11 October 2026. If a maker changes a figure after that date, the maker’s page is right and this one is out of date.

conner mcdonald

Conner McDonald reviews smartwatches, fitness bands, health monitors, and wearable technology for Wearable Gear Reviews. Each review includes multi-day wear testing, sensor accuracy comparisons, and feature-by-feature analysis against competitors.

Written byconner mcdonald

Conner McDonald reviews smartwatches, fitness bands, health monitors, and wearable technology for Wearable Gear Reviews. Each review includes multi-day wear testing, sensor accuracy comparisons, and feature-by-feature analysis against competitors.