Amazfit T-Rex 2 vs Fitbit Versa 3
The Verdict
Both watches cost $229 but serve different priorities. The T-Rex 2 features a larger 47mm AMOLED display with 454 x 454 resolution versus Versa 3's 40mm screen at 336 x 336 pixels, making the Amazfit better for reading metrics at a glance. Battery life heavily favors T-Rex 2 with up to 24 days typical usage compared to Versa 3's 6+ days, a significant advantage for those who dislike frequent charging. T-Rex 2 also offers superior durability with 10ATM water resistance and heavier construction suitable for rugged activities, plus 45 hours of GPS performance. However, Fitbit Versa 3 compensates with lighter weight (40g vs 66.5g), superior connectivity through NFC and WiFi capabilities, and tighter Fitbit ecosystem integration for those already invested in the platform. Health tracking is nearly identical: both include heart rate, SpO2, and sleep monitoring without ECG. Choose T-Rex 2 if battery life and screen size matter most, especially for outdoor enthusiasts. Pick Versa 3 if you value lightweight comfort, contactless payments via NFC, and seamless Fitbit app integration.
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 Fitbit Versa 3 if…
- →Built-in GPS is a major upgrade over Versa 2
- →6+ day battery easily lasts a full week for most users
- →AMOLED display is bright and crisp
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
Fitbit Versa 3
Pros
- Built-in GPS is a major upgrade over Versa 2
- 6+ day battery easily lasts a full week for most users
- AMOLED display is bright and crisp
- Google Assistant and Alexa voice assistant support
- Lightweight at 40 g — comfortable for sleep tracking
Cons
- Capacitive side button is imprecise and frustrating
- No ECG or EDA stress sensor — need Sense for those
- Fitbit OS has a very limited app store
- SpO2 tracking requires a specific watch face to display
Full Specifications
| Spec | Amazfit T-Rex 2 | Fitbit Versa 3 |
|---|---|---|
| Software | Zepp OS | Fitbit OS |
| Body | ||
| Weight | 66.5 g (without strap) | 40 g |
| Case material | Fiber-reinforced polymer with metal buttons | Aluminum |
| Water resistance | 10ATM | 5ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 24 days (typical), 45 hrs GPS | Up to 6+ days |
| Display | ||
| Size | 47mm | 40mm (1.58 inches) |
| Type | AMOLED Always-On | AMOLED |
| Always-on display | ||
| Resolution | 454 x 454 | 336 x 336 |
| Processor | ||
| Chipset | Huami custom SoC | Fitbit custom processor |
| 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 Fitbit products. View full details for the Amazfit T-Rex 2 or the Fitbit Versa 3.