Amazfit T-Rex Ultra vs Samsung Galaxy Watch Ultra
Samsung Galaxy Watch Ultra dominates with superior health features including ECG and skin temperature monitoring absent from the T-Rex Ultra. Its titanium construction weighs significantly less (60.5g vs 89g) while offering exceptional durability via MIL-STD certification. Display quality favors Samsung with 3000-nit Super AMOLED brightness and sapphire crystal protection versus Amazfit's standard AMOLED panel. Battery performance tells a different story—Amazfit claims 20 days typical use compared to Samsung's 60 hours maximum, even in power-saving mode, making the T-Rex Ultra substantially more practical for extended outdoor adventures. Connectivity features heavily favor Samsung with NFC, WiFi, and cellular options enabling standalone functionality. Amazfit compensates with aggressive pricing at $449.99 versus $649.99. For users prioritizing health data comprehensiveness and premium build quality, Samsung wins decisively. However, adventurers demanding multi-week battery life and outstanding value should choose the T-Rex Ultra.
Full Specifications
| Spec | Amazfit T-Rex Ultra | Samsung Galaxy Watch Ultra |
|---|---|---|
| Software | Zepp OS 2.0 | Wear OS 5 with One UI Watch 6 |
| Body | ||
| Weight | 89 g | 60.5 g |
| Case material | Stainless steel bezel, fiber-reinforced polymer case | Titanium Grade 4 |
| Water resistance | 10 ATM, ISO 22810 certified for free-diving to 45m | 10ATM + 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 60 hours in Power Saving mode (590 mAh) |
| Display | ||
| Size | 1.39 inch | 47mm (1.5") |
| Type | AMOLED | Super AMOLED with Sapphire Crystal glass, up to 3000 nits |
| Always-on display | ||
| Resolution | 454 x 454 | 480 x 480 |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.3 |
| Processor | ||
| RAM | — | 2 GB |
| Chipset | — | Samsung Exynos W1000 (3nm, 5-core) |
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 Ultra
Pros
- Premium titanium build with 10ATM water resistance and MIL-STD durability
- Bright 3000-nit Super AMOLED display with sapphire crystal protection
- Dual-frequency GPS (L1 + L5) for precise outdoor tracking
- Big 590 mAh battery delivers up to 100 hours in Power Saving mode
- Customizable Quick Button for fast access to workouts and apps
Cons
- Very expensive at $649 — Samsung's priciest watch yet
- Only one 47mm size, too large for smaller wrists
- BioActive sensor and BP/ECG features require Samsung phone
- Design closely mimics Apple Watch Ultra
- Limited third-party app ecosystem versus Apple Watch
Related Comparisons
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 Ultra.