Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - Watch SE 3 | Samsung - Galaxy Watch 7 Pro |
|---|---|---|
| Battery life | 18 h | 80 h |
| Peak brightness | 1000 nits | 3000 nits |
| Weight | 33 g | 60 g |
| Display size | 1.78 " | 1.5 " |
| Water resistance | 5 ATM | 10 ATM |
| ECG | false | true |
Between the Watch SE 3 and Galaxy Watch 7 Pro, the Watch SE 3 comes out ahead in weight / display size, while the Galaxy Watch 7 Pro wins on battery life / peak brightness. Overall, the Watch SE 3 scores 55.9 and the Galaxy Watch 7 Pro scores 68 on our Mars Score.
Which should you buy?
The Galaxy Watch 7 Pro is the clear pick on raw spec strength, leading by 12.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
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, display size. The single most decisive one: Weight — 27.00 g less. 33 vs 60.
Pick the Galaxy Watch 7 Pro 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 battery life, peak brightness, water resistance, among others. The single most decisive one: Battery life — 344.44% more. 80 h vs 18 h.
Both ship with comparable cellular, so those specs do not separate the two — focus on the differences below.
Bottom line: the Galaxy Watch 7 Pro is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Apple - Watch SE 3 or Samsung - Galaxy Watch 7 Pro?
Samsung - Galaxy Watch 7 Pro leads the current Mars Score by 12.1 points.The more useful decision is the trade-off behind that result: compare display size, battery life against the way you will actually use the product.
Choose Apple - Watch SE 3 if…
Apple - Watch SE 3 has the measurable edge on weight g, display size in.
Choose Samsung - Galaxy Watch 7 Pro if…
Samsung - Galaxy Watch 7 Pro has the measurable edge on battery life h, peak brightness nits, water resistance atm.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Apple - Watch SE 3 wins
- ▲Weight — 27.00 g less. 33 vs 60.
- ▲Display size — 18.67% more. 1.78 " vs 1.5 ".
Why Samsung - Galaxy Watch 7 Pro wins
- ▲Battery life — 344.44% more. 80 h vs 18 h.
- ▲Peak brightness — 200.00% more. 3000 nits vs 1000 nits.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
- ▲Has ECG.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE 3 | Samsung - Galaxy Watch 7 Pro |
|---|---|---|
| Case size | 44 mm | 47 mmlead |
| Weight | 33 glead | 60 g |
| Case material | aluminum | titanium |
| Water resistanceⓘ | 5 ATM | 10 ATMlead |
Display
| Spec | Apple - Watch SE 3 | Samsung - Galaxy Watch 7 Pro |
|---|---|---|
| Display size | 1.78 "lead | 1.5 " |
| Always-on display | false | truelead |
| Peak brightnessⓘ | 1000 nits | 3000 nitslead |
Health & Fitness
| Spec | Apple - Watch SE 3 | Samsung - Galaxy Watch 7 Pro |
|---|---|---|
| ECG | false | truelead |
| SpO2 | false | truelead |
| Temperature sensor | false | truelead |
| Sleep tracking | true | true |
| Blood pressure | false | truelead |
Battery & Connectivity
| Spec | Apple - Watch SE 3 | Samsung - Galaxy Watch 7 Pro |
|---|---|---|
| Battery lifeⓘ | 18 h | 80 hlead |
| GPS | true | true |
| Cellular | true | true |
| NFC | true | true |
| OS | watchOS | Wear OSlead |
Frequently asked
Which has longer battery life, Watch SE 3 or Galaxy Watch 7 Pro?+
Galaxy Watch 7 Pro lasts 80 hours vs 18 hours.
Do Watch SE 3 or Galaxy Watch 7 Pro support ECG?+
Galaxy Watch 7 Pro supports ECG; Watch SE 3 does not.
Which has cellular, Watch SE 3 or Galaxy Watch 7 Pro?+
Both offer cellular variants.