Between the Watch SE 3 and Vantage V3, the Watch SE 3 comes out ahead in display size and weight, while the Vantage V3 wins on battery life and ecg. Overall, the Watch SE 3 scores 56.1 and the Vantage V3 scores 53.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (56.1 vs 53.5). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
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 display size, weight, cellular.
Pick the Vantage V3 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, ecg, spo2.
Both ship with comparable water resistance, peak brightness, 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 3 wins
- ▲Display size — 28.06% more. 1.78 " vs 1.39 ".
- ▲Weight — 24.00 g less. 33 vs 57.
- ▲Has Cellular.
Why Polar - Vantage V3 wins
- ▲Battery life — 833.33% more. 168 h vs 18 h.
- ▲Has ECG.
- ▲Has SpO2.
Spec comparison
Design
| Spec | Apple - Watch SE 3 | Polar - Vantage V3 |
|---|---|---|
| Case size | 44 mm | 47 mmlead |
| Weight | 33 glead | 57 g |
| Case material | aluminum | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Apple - Watch SE 3 | Polar - Vantage V3 |
|---|---|---|
| Display size | 1.78 "lead | 1.39 " |
| Always-on display | false | truelead |
| Peak brightnessⓘ | 1000 nits | 1000 nits |
Health & Fitness
| Spec | Apple - Watch SE 3 | Polar - Vantage V3 |
|---|---|---|
| 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 | Polar - Vantage V3 |
|---|---|---|
| Battery life | 18 h | 168 hlead |
| GPS | true | true |
| Cellular | truelead | false |
| NFC | truelead | false |
| OS | watchOS | Polar OSlead |
Frequently asked
Which has longer battery life, Watch SE 3 or Vantage V3?+
Vantage V3 lasts 168h vs 18h.
Do Watch SE 3 or Vantage V3 support ECG?+
Vantage V3 supports ECG; Watch SE 3 does not.
Which has cellular, Watch SE 3 or Vantage V3?+
Watch SE 3 offers a cellular variant; Vantage V3 is Wi-Fi only.
Spec-level deep dives
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