Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Battery life | 672 h | 18 h |
| Display size | 1.5 " | 2.04 " |
| Weight | 68 g | 36.4 g |
| Water resistance | 10 ATM | 5 ATM |
| ECG | false | true |
| Cellular | false | true |
Between the T-Rex 3 and Watch Series 10 (46mm), the T-Rex 3 comes out ahead in battery life / water resistance, while the Watch Series 10 (46mm) wins on display size / weight. Overall, the T-Rex 3 scores 62.7 and the Watch Series 10 (46mm) scores 76.9 on our Mars Score.
Which should you buy?
The Watch Series 10 (46mm) is the clear pick on raw spec strength, leading by 14.2 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, water resistance. The single most decisive one: Battery life — 3633.33% more. 672 h vs 18 h.
Pick the Watch Series 10 (46mm) if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are display size, weight, ecg, among others. The single most decisive one: Display size — 36.00% more. 2.04 " vs 1.5 ".
Both ship with comparable spo2, peak brightness, so those specs do not separate the two — focus on the differences below.
Bottom line: the Watch Series 10 (46mm) 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: Amazfit - T-Rex 3 or Apple - Watch Series 10 (46mm)?
Apple - Watch Series 10 (46mm) leads the current Mars Score by 14.2 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 Amazfit - T-Rex 3 if…
Amazfit - T-Rex 3 has the measurable edge on battery life h, water resistance atm.
Choose Apple - Watch Series 10 (46mm) if…
Apple - Watch Series 10 (46mm) has the measurable edge on display size in, weight g, 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 Amazfit - T-Rex 3 wins
- ▲Battery life — 3633.33% more. 672 h vs 18 h.
- ▲Water resistance — 5.00 ATM more. 10 vs 5.
Why Apple - Watch Series 10 (46mm) wins
- ▲Display size — 36.00% more. 2.04 " vs 1.5 ".
- ▲Weight — 31.60 g less. 36.4 vs 68.
- ▲Has ECG.
- ▲Has Cellular.
Spec comparison
Design
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Case size | 48.5 mmlead | 46 mm |
| Weight | 68 g | 36.4 glead |
| Case material | polymer | aluminum |
| Water resistanceⓘ | 10 ATMlead | 5 ATM |
Display
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Display size | 1.5 " | 2.04 "lead |
| Always-on display | true | true |
| Peak brightnessⓘ | 2000 nits | 2000 nits |
Health & Fitness
| Spec | Amazfit - T-Rex 3 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| 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 | Apple - Watch Series 10 (46mm) |
|---|---|---|
| Battery lifeⓘ | 672 hlead | 18 h |
| GPS | true | true |
| Cellular | false | truelead |
| NFC | false | truelead |
| OS | Zepp OSlead | watchOS |
Frequently asked
Which has longer battery life, T-Rex 3 or Watch Series 10 (46mm)?+
T-Rex 3 lasts 672 hours vs 18 hours.
Do T-Rex 3 or Watch Series 10 (46mm) support ECG?+
Watch Series 10 (46mm) supports ECG; T-Rex 3 does not.
Which has cellular, T-Rex 3 or Watch Series 10 (46mm)?+
Watch Series 10 (46mm) offers a cellular variant; T-Rex 3 is Wi-Fi only.