Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Google - Pixel Watch 3 (45mm) | Polar - Vantage V3 |
|---|---|---|
| Battery life | 36 h | 168 h |
| Peak brightness | 2000 nits | 1000 nits |
| Weight | 37 g | 57 g |
| Cellular | true | false |
| Display size | 1.4 " | 1.39 " |
Between the Pixel Watch 3 (45mm) and Vantage V3, the Pixel Watch 3 (45mm) comes out ahead in peak brightness / weight, while the Vantage V3 wins on battery life. Overall, the Pixel Watch 3 (45mm) scores 69.5 and the Vantage V3 scores 69.2 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.5 vs 69.2). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Pixel Watch 3 (45mm) if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are peak brightness, weight, cellular, among others. The single most decisive one: Peak brightness — 100.00% more. 2000 nits vs 1000 nits.
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. The single most decisive one: Battery life — 366.67% more. 168 h vs 36 h.
Both ship with comparable ecg, spo2, water resistance, so those specs do not 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 says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Google - Pixel Watch 3 (45mm) or Polar - Vantage V3?
Google - Pixel Watch 3 (45mm) leads the current Mars Score by 0.3 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 Google - Pixel Watch 3 (45mm) if…
Google - Pixel Watch 3 (45mm) has the measurable edge on peak brightness nits, weight g, has cellular.
Choose Polar - Vantage V3 if…
Polar - Vantage V3 has the measurable edge on battery life h.
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 Google - Pixel Watch 3 (45mm) wins
- ▲Peak brightness — 100.00% more. 2000 nits vs 1000 nits.
- ▲Weight — 20.00 g less. 37 vs 57.
- ▲Has Cellular.
- ▲Display size — 0.72% more. 1.4 " vs 1.39 ".
Why Polar - Vantage V3 wins
- ▲Battery life — 366.67% more. 168 h vs 36 h.
Spec comparison
Design
| Spec | Google - Pixel Watch 3 (45mm) | Polar - Vantage V3 |
|---|---|---|
| Case size | 45 mm | 47 mmlead |
| Weight | 37 glead | 57 g |
| Case material | aluminum | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Google - Pixel Watch 3 (45mm) | Polar - Vantage V3 |
|---|---|---|
| Display size | 1.4 "lead | 1.39 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nitslead | 1000 nits |
Health & Fitness
| Spec | Google - Pixel Watch 3 (45mm) | Polar - Vantage V3 |
|---|---|---|
| ECG | true | true |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Google - Pixel Watch 3 (45mm) | Polar - Vantage V3 |
|---|---|---|
| Battery lifeⓘ | 36 h | 168 hlead |
| GPS | true | true |
| Cellular | truelead | false |
| NFC | truelead | false |
| OS | WearOS | Polar OSlead |
Frequently asked
Which has longer battery life, Pixel Watch 3 (45mm) or Vantage V3?+
Vantage V3 lasts 168 hours vs 36 hours.
Do Pixel Watch 3 (45mm) or Vantage V3 support ECG?+
Both support ECG.
Which has cellular, Pixel Watch 3 (45mm) or Vantage V3?+
Pixel Watch 3 (45mm) offers a cellular variant; Vantage V3 is Wi-Fi only.