Between the Watch SE (2nd gen) and Watch Ultra 2, the Watch SE (2nd gen) comes out ahead in weight, while the Watch Ultra 2 wins on peak brightness and battery life. Overall, the Watch SE (2nd gen) scores 56.1 and the Watch Ultra 2 scores 60.5 on our Mars Score.
Which should you buy?
The Watch Ultra 2 edges ahead on the Mars Score (56.1 vs 60.5), but the 4.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Watch SE (2nd gen) if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight.
Pick the Watch Ultra 2 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are peak brightness, battery life, display size, among others.
Both ship with comparable cellular, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Apple - Watch SE (2nd gen) wins
- ▲Weight — 28.40 g less. 33 vs 61.4.
Why Apple - Watch Ultra 2 wins
- ▲Peak brightness — 200.00% more. 3000 nits vs 1000 nits.
- ▲Battery life — 100.00% more. 36 h vs 18 h.
- ▲Display size — 7.87% more. 1.92 " vs 1.78 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Has ECG.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch Ultra 2 |
|---|---|---|
| Case size | 44 mm | 49 mmlead |
| Weight | 33 glead | 61.4 g |
| Case material | aluminum | titanium |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |
Display
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch Ultra 2 |
|---|---|---|
| Display size | 1.78 " | 1.92 "lead |
| Always-on display | false | truelead |
| Peak brightnessⓘ | 1000 nits | 3000 nitslead |
Health & Fitness
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch Ultra 2 |
|---|---|---|
| ECG | false | truelead |
| SpO2 | false | truelead |
| Temperature sensor | false | truelead |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch Ultra 2 |
|---|---|---|
| Battery life | 18 h | 36 hlead |
| GPS | true | true |
| Cellular | true | true |
| NFC | true | true |
| OS | watchOS | watchOS |
Frequently asked
Which has longer battery life, Watch SE (2nd gen) or Watch Ultra 2?+
Watch Ultra 2 lasts 36h vs 18h.
Do Watch SE (2nd gen) or Watch Ultra 2 support ECG?+
Watch Ultra 2 supports ECG; Watch SE (2nd gen) does not.
Which has cellular, Watch SE (2nd gen) or Watch Ultra 2?+
Both offer cellular variants.
Spec-level deep dives
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