Between the T-Rex 3 and Pixel Watch 4, the T-Rex 3 comes out ahead in battery life and display size, while the Pixel Watch 4 wins on peak brightness and weight. Overall, the T-Rex 3 scores 79.7 and the Pixel Watch 4 scores 47.4 on our Mars Score.
Which should you buy?
The T-Rex 3 is the clear pick on raw spec strength, leading by 32.3 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 T-Rex 3 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, display size, water resistance.
Pick the Pixel Watch 4 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, weight, ecg, among others.
Both ship with comparable spo2, so those specs don't separate the two — focus on the differences below.
Bottom line: the T-Rex 3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Amazfit - T-Rex 3 wins
- ▲Battery life — 1300.00% more. 672 h vs 48 h.
- ▲Display size — 7.14% more. 1.5 " vs 1.4 ".
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Google - Pixel Watch 4 wins
- ▲Peak brightness — 50.00% more. 3000 nits vs 2000 nits.
- ▲Weight — 31.00 g less. 37 vs 68.
- ▲Has ECG.
- ▲Has Cellular.
Spec comparison
Design
| Spec | Amazfit - T-Rex 3 | Google - Pixel Watch 4 |
|---|---|---|
| Case size | 48.5 mmlead | 45 mm |
| Weight | 68 g | 37 glead |
| Case material | polymer | aluminum |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Amazfit - T-Rex 3 | Google - Pixel Watch 4 |
|---|---|---|
| Display size | 1.5 "lead | 1.4 " |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nits | 3000 nitslead |
Health & Fitness
| Spec | Amazfit - T-Rex 3 | Google - Pixel Watch 4 |
|---|---|---|
| ECG | false | truelead |
| SpO2 | true | true |
| Temperature sensor | true | true |
| Sleep tracking | true | true |
| Blood pressure | false | false |
Battery & Connectivity
| Spec | Amazfit - T-Rex 3 | Google - Pixel Watch 4 |
|---|---|---|
| Battery life | 672 hlead | 48 h |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | false | truelead |
| OS | Zepp OSlead | WearOS |
Frequently asked
Which has longer battery life, T-Rex 3 or Pixel Watch 4?+
T-Rex 3 lasts 672h vs 48h.
Do T-Rex 3 or Pixel Watch 4 support ECG?+
Pixel Watch 4 supports ECG; T-Rex 3 does not.
Which has cellular, T-Rex 3 or Pixel Watch 4?+
Pixel Watch 4 offers a cellular variant; T-Rex 3 is Wi-Fi only.
Spec-level deep dives
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