Garmin - vívoactive 5 vs Google - Pixel Watch 3 (45mm)
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Garmin - vívoactive 5 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Battery life | 264 h | 36 h |
| Peak brightness | 1000 nits | 2000 nits |
| Display size | 1.2 " | 1.4 " |
| Weight | 26 g | 37 g |
| ECG | false | true |
| Cellular | false | true |
Between the vívoactive 5 and Pixel Watch 3 (45mm), the vívoactive 5 comes out ahead in battery life / weight, while the Pixel Watch 3 (45mm) wins on peak brightness / display size. Overall, the vívoactive 5 scores 55.7 and the Pixel Watch 3 (45mm) scores 69.5 on our Mars Score.
Which should you buy?
The Pixel Watch 3 (45mm) is the clear pick on raw spec strength, leading by 13.8 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 vívoactive 5 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery life, weight. The single most decisive one: Battery life — 633.33% more. 264 h vs 36 h.
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. Its strongest claims are peak brightness, display size, ecg, among others. The single most decisive one: Peak brightness — 100.00% more. 2000 nits vs 1000 nits.
Both ship with comparable spo2, water resistance, so those specs do not separate the two — focus on the differences below.
Bottom line: the Pixel Watch 3 (45mm) 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: Garmin - vívoactive 5 or Google - Pixel Watch 3 (45mm)?
Google - Pixel Watch 3 (45mm) leads the current Mars Score by 13.8 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 Garmin - vívoactive 5 if…
Garmin - vívoactive 5 has the measurable edge on battery life h, weight g.
Choose Google - Pixel Watch 3 (45mm) if…
Google - Pixel Watch 3 (45mm) has the measurable edge on peak brightness nits, display size in, has ecg.
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 Garmin - vívoactive 5 wins
- ▲Battery life — 633.33% more. 264 h vs 36 h.
- ▲Weight — 11.00 g less. 26 vs 37.
Why Google - Pixel Watch 3 (45mm) wins
- ▲Peak brightness — 100.00% more. 2000 nits vs 1000 nits.
- ▲Display size — 16.67% more. 1.4 " vs 1.2 ".
- ▲Has ECG.
- ▲Has Cellular.
Spec comparison
Design
| Spec | Garmin - vívoactive 5 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Case size | 42 mm | 45 mmlead |
| Weight | 26 glead | 37 g |
| Case material | polymer | aluminum |
| Water resistanceⓘ | 5 ATM | 5 ATM |
Display
| Spec | Garmin - vívoactive 5 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Display size | 1.2 " | 1.4 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 1000 nits | 2000 nitslead |
Health & Fitness
| Spec | Garmin - vívoactive 5 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| ECG | false | truelead |
| SpO2 | true | true |
| Temperature sensor | false | truelead |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Garmin - vívoactive 5 | Google - Pixel Watch 3 (45mm) |
|---|---|---|
| Battery lifeⓘ | 264 hlead | 36 h |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | true | true |
| OS | Garmin OSlead | WearOS |
Frequently asked
Which has longer battery life, vívoactive 5 or Pixel Watch 3 (45mm)?+
vívoactive 5 lasts 264 hours vs 36 hours.
Do vívoactive 5 or Pixel Watch 3 (45mm) support ECG?+
Pixel Watch 3 (45mm) supports ECG; vívoactive 5 does not.
Which has cellular, vívoactive 5 or Pixel Watch 3 (45mm)?+
Pixel Watch 3 (45mm) offers a cellular variant; vívoactive 5 is Wi-Fi only.