Between the Watch SE 3 and Watch Series 10 (46mm), the Watch SE 3 comes out ahead in weight, while the Watch Series 10 (46mm) wins on peak brightness and display size. Overall, the Watch SE 3 scores 56.1 and the Watch Series 10 (46mm) scores 62.7 on our Mars Score.
Which should you buy?
The Watch Series 10 (46mm) edges ahead on the Mars Score (56.1 vs 62.7), but the 6.6-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Watch SE 3 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 Series 10 (46mm) if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are peak brightness, display size, ecg, among others.
Both ship with comparable battery life, cellular, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Watch Series 10 (46mm) is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Apple - Watch SE 3 wins
- ▲Weight — 3.40 g less. 33 vs 36.4.
Why Apple - Watch Series 10 (46mm) wins
- ▲Peak brightness — 100.00% more. 2000 nits vs 1000 nits.
- ▲Display size — 14.61% more. 2.04 " vs 1.78 ".
- ▲Has ECG.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Case size | 44 mm | 46 mmlead |
| Weight | 33 glead | 36.4 g |
| Case material | aluminum | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Apple - Watch SE 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Display size | 1.78 " | 2.04 "lead |
| Always-on display | false | truelead |
| Peak brightnessⓘ | 1000 nits | 2000 nitslead |
Health & Fitness
| Spec | Apple - Watch SE 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| ECG | false | truelead |
| SpO2 | false | truelead |
| Temperature sensor | false | truelead |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Apple - Watch SE 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| 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 3 or Watch Series 10 (46mm)?+
Watch Series 10 (46mm) lasts 18h vs 18h.
Do Watch SE 3 or Watch Series 10 (46mm) support ECG?+
Watch Series 10 (46mm) supports ECG; Watch SE 3 does not.
Which has cellular, Watch SE 3 or Watch Series 10 (46mm)?+
Both offer cellular variants.
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.