WhichOneToGet
Compare Β· Updated 19 Oct 2026

Apple Watch Series 12 vs Apple Watch SE 3

Get the Apple Watch Series 12. Unless you mostly want notifications, payments and workouts β€” then the SE 3 runs as fast and costs much less.

Apple Watch Series 12
Our pick

Apple Watch Series 12

The best smartwatch for iPhone owners: excellent health and heart-rate tracking, a new daily Readiness score and a bright screen. Battery still lasts about a day.

Apple Watch SE 3

Apple Watch SE 3

The best value Apple Watch: the same fast chip as Apple's pricier watches, an always-on screen and sleep and fitness tracking. No ECG or blood oxygen.

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The short answer

Both need an iPhone and do notifications, payments, workouts and sleep tracking well. The Series 12 adds ECG, blood oxygen, a daily Readiness score, a better screen and a few more hours of battery; the SE 3 does the everyday things for much less.

Get the Apple Watch Series 12 if
  • β€”You want the fullest health tracking, including ECG.
  • β€”You'd use a daily Readiness score to plan workouts.
  • β€”You want a few more hours between charges.
Check price at Best BuyBuy β†—
Get the Apple Watch SE 3 if
  • β€”You want an Apple Watch for as little as possible.
  • β€”It's a first smartwatch, or one for a teenager.
  • β€”You don't need ECG or blood oxygen.
Check price at Best BuyBuy β†—

Key differences

Health tracking
ECG, blood oxygen, Readiness score
Apple Watch Series 12
No ECG, blood oxygen or hypertension alerts
Apple Watch SE 3
Screen
Bright, always-on
Apple Watch Series 12
Always-on, with wider borders
Apple Watch SE 3
Battery
About 24 hours
Apple Watch Series 12
About 18 hours
Apple Watch SE 3

Pros and cons

Apple Watch Series 12
  • +Accurate heart-rate and health tracking
  • +Daily Readiness score
  • +Bright, always-on screen
  • βˆ’Battery lasts about a day, so it charges nightly.
  • βˆ’Looks almost identical to the last two models.
  • βˆ’Some new features arrive later in software updates.
  • βˆ’Its GPS isn't as precise as the Ultra's dual-band GPS.
Apple Watch SE 3
  • +Same chip as Apple's pricier watches
  • +Always-on screen
  • +Sleep and fitness tracking
  • βˆ’No ECG, blood oxygen or hypertension notifications.
  • βˆ’Older design with wider borders round the screen.
  • βˆ’Battery lasts about 18 hours.

Ready to choose?

How we reached this verdict

We compared independent expert reviews with the manufacturer's specifications, then checked it's sold at a major retailer where you live. We don't test products ourselves.

Sources: Tom's Guide, TechRadar, TechRadar, manufacturer specifications.

Updated 19 Oct 2026How we decide