Between the Watch SE (2nd gen) and Watch SE 3, the Watch SE (2nd gen) comes out ahead in several specs, while the Watch SE 3 wins on several specs. Overall, the Watch SE (2nd gen) scores 56.1 and the Watch SE 3 scores 56.1 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes, with the decision sitting on which individual spec advantages weigh more for your use.
The Watch SE (2nd gen) doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
The Watch SE 3 similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable battery life, ecg, display size, 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
- No decisive advantages.
Why Apple - Watch SE 3 wins
- No decisive advantages.
Spec comparison
Design
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch SE 3 |
|---|---|---|
| Case size | 44 mm | 44 mm |
| Weight | 33 g | 33 g |
| Case material | aluminum | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch SE 3 |
|---|---|---|
| Display size | 1.78 " | 1.78 " |
| Always-on display | false | false |
| Peak brightnessⓘ | 1000 nits | 1000 nits |
Health & Fitness
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch SE 3 |
|---|---|---|
| ECG | false | false |
| SpO2 | false | false |
| Temperature sensor | false | false |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch SE (2nd gen) | Apple - Watch SE 3 |
|---|---|---|
| Battery life | 18 h | 18 h |
| 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 SE 3?+
Watch SE 3 lasts 18h vs 18h.
Do Watch SE (2nd gen) or Watch SE 3 support ECG?+
Neither supports ECG.
Which has cellular, Watch SE (2nd gen) or Watch SE 3?+
Both offer cellular variants.
Spec-level deep dives
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