Amazfit T-Rex 2 vs Samsung Galaxy Watch 3
The Verdict
Amazfit T-Rex 2 and Samsung Galaxy Watch 3 target different priorities. Amazfit delivers exceptional battery life reaching 24 days on a single charge, compared to Galaxy Watch 3's modest 1.5 days, making it ideal for adventure and travel. The T-Rex 2 features a larger 47mm AMOLED display with 454x454 resolution versus Galaxy Watch 3's 360x360, offering sharper text and clearer visuals. Both track heart rate and blood oxygen, though Galaxy Watch 3 adds ECG capability and NFC for contactless payments. Galaxy Watch 3 excels with stainless steel or titanium construction, superior 5ATM water resistance plus IP68 rating, WiFi and cellular connectivity for independence from your phone, and tighter Tizen OS integration with Samsung devices. T-Rex 2 prioritizes ruggedness with fiber-reinforced polymer and military-grade durability, plus GPS for standalone navigation. At $229 versus $399, Amazfit offers remarkable value for fitness enthusiasts and outdoor adventurers willing to sacrifice premium materials and advanced features. Samsung justifies its premium price through build quality, payment capability, and ecosystem integration if you're invested in Galaxy devices. Choose Amazfit for battery longevity and outdoor capability; choose Galaxy Watch 3 for refined design and comprehensive smartwatch features.
Who Should Buy
Buy the Amazfit T-Rex 2 if…
- →MIL-STD-810G rated for extreme temperature, humidity, and shock resistance
- →24-day battery life with 45 hours of continuous GPS tracking
- →10ATM water resistance for swimming and water sports
Buy the Samsung Galaxy Watch 3 if…
- →Physical rotating bezel provides tactile, satisfying navigation
- →Premium stainless steel build with classic watch aesthetics
- →ECG and SpO2 monitoring were cutting-edge at launch
Category Scores
Pros & Cons
Amazfit T-Rex 2
Pros
- MIL-STD-810G rated for extreme temperature, humidity, and shock resistance
- 24-day battery life with 45 hours of continuous GPS tracking
- 10ATM water resistance for swimming and water sports
- Dual-band GPS for accurate outdoor positioning
- AMOLED display is vibrant and readable in sunlight
Cons
- 66.5 g is heavy — can be uncomfortable for sleep tracking
- No NFC or cellular connectivity
- Zepp OS has limited smart features and app support
- No ECG monitoring
- Bulky design may not suit formal or everyday casual wear
Samsung Galaxy Watch 3
Pros
- Physical rotating bezel provides tactile, satisfying navigation
- Premium stainless steel build with classic watch aesthetics
- ECG and SpO2 monitoring were cutting-edge at launch
- Fall detection with automatic SOS alerts
- Thinner and lighter than Galaxy Watch (2018)
Cons
- Tizen OS is now discontinued — no new app development
- Battery life of 1.5 days typical requires frequent charging
- Older Exynos 9110 is noticeably slower than W920
- Heavy at 48-54 g — uncomfortable for sleep tracking
Full Specifications
| Spec | Amazfit T-Rex 2 | Samsung Galaxy Watch 3 |
|---|---|---|
| Software | Zepp OS | Tizen OS 5.5 |
| Body | ||
| Weight | 66.5 g (without strap) | 48.2 g (41mm) / 53.8 g (45mm) |
| Case material | Fiber-reinforced polymer with metal buttons | Stainless Steel / Titanium |
| Water resistance | 10ATM | 5ATM + IP68, MIL-STD-810G |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 24 days (typical), 45 hrs GPS | Up to 2 days (typical ~1.5 days) |
| Display | ||
| Size | 47mm | 41mm / 45mm |
| Type | AMOLED Always-On | Super AMOLED |
| Always-on display | ||
| Resolution | 454 x 454 | 360 x 360 |
| Processor | ||
| Chipset | Huami custom SoC | Exynos 9110 |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.0 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
Explore more in smartwatches, see all Amazfit products or all Samsung products. View full details for the Amazfit T-Rex 2 or the Samsung Galaxy Watch 3.