Amazfit T-Rex Ultra vs Samsung Galaxy Watch 5
The Verdict
Samsung Galaxy Watch 5 delivers superior smartwatch features at a significantly lower price point. Its Wear OS 3.5 platform offers deeper app ecosystem integration, NFC for payments, and dual-band GPS for precision tracking,advantages the T-Rex Ultra simply cannot match. Health monitoring on the Galaxy Watch 5 includes ECG and skin temperature sensors versus the T-Rex Ultra's more basic suite. Battery life claims favor T-Rex Ultra (20 days vs 24 hours typical), but the Galaxy Watch 5's wireless charging and realistic battery performance matter more practically. Design-wise, the T-Rex Ultra's rugged 89g build suits extreme sports enthusiasts, while Galaxy Watch 5's lighter, more refined aluminum frame works better for daily wear. At $449.99 versus $279.00, the T-Rex Ultra doesn't justify its premium through features or performance. Galaxy Watch 5 emerges as the clear winner for most users seeking a versatile, feature-rich smartwatch.
Who Should Buy
Buy the Amazfit T-Rex Ultra if…
- →Excellent 20-day battery life with always-on display
- →Dual-band six-satellite GPS for high accuracy
- →Rugged design with 15 military-grade certifications
Buy the Samsung Galaxy Watch 5 if…
- →Sapphire crystal display is 60% more durable than Watch 4
- →Comprehensive health suite: ECG, SpO2, skin temp, body composition
- →Dual-frequency GPS for accurate outdoor tracking
Category Scores
Pros & Cons
Amazfit T-Rex Ultra
Pros
- Excellent 20-day battery life with always-on display
- Dual-band six-satellite GPS for high accuracy
- Rugged design with 15 military-grade certifications
- Free-diving rated to 45 meters
- Offline maps with route import support
Cons
- No ECG, skin temperature, or NFC payments
- No Wi-Fi or cellular connectivity
- Zepp OS app ecosystem is limited
- Heavier than most smartwatches at 89g
- No third-party app store
Samsung Galaxy Watch 5
Pros
- Sapphire crystal display is 60% more durable than Watch 4
- Comprehensive health suite: ECG, SpO2, skin temp, body composition
- Dual-frequency GPS for accurate outdoor tracking
- Faster charging — 30% improvement over Galaxy Watch 4
- MIL-STD-810H military-grade durability rating
Cons
- Removed the beloved rotating bezel — now touch-only
- Battery rarely hits the advertised 40 hours in real use
- Requires a Samsung phone for ECG and blood pressure features
- Wear OS 3 app selection still lags behind Apple watchOS
Full Specifications
| Spec | Amazfit T-Rex Ultra | Samsung Galaxy Watch 5 |
|---|---|---|
| Software | Zepp OS 2.0 | Wear OS 3.5 (One UI Watch 4.5) |
| Body | ||
| Weight | 89 g | 28.7 g (40mm) / 33.5 g (44mm) |
| Case material | Stainless steel bezel, fiber-reinforced polymer case | Aluminum with Sapphire Crystal glass |
| Water resistance | 10 ATM, ISO 22810 certified for free-diving to 45m | 5ATM + IP68, MIL-STD-810H |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 20 days typical use, 80 hours GPS | Up to 40 hrs (typical ~24 hrs) |
| Display | ||
| Size | 1.39 inch | 40mm / 44mm |
| Type | AMOLED | Super AMOLED |
| Always-on display | ||
| Resolution | 454 x 454 | 396 x 396 / 450 x 450 |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.2 |
| Processor | ||
| Chipset | — | Exynos W920 |
Related Comparisons
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 Ultra or the Samsung Galaxy Watch 5.