Featured in this comparison chart are two rugged sports smartwatches from Huami/Xiaomi; the T-Rex vs Stratos 3 – Which is a better smartwatch. The T-Rex is a relatively newer rugged-looking smartwatch certified with MIL-STD-810 – US military-grade rating, while the Stratos 3 is a more equipped and sophisticated smartwatch with more fitness tracking features, durable build, and onboard music storage. Compare these two fine smartwatches to find out the differences.
Amazfit T-Rex vs Stratos 3: Specifications Compared
| Product Info |  Amazfit T-Rex Specifications, Features and Price |
 Amazfit Stratos 3 Specifications, Features and Price |
|---|---|---|
| Price | $139.99 | $176.99 |
| ABOUT DEVICE | ABOUT DEVICE | ABOUT DEVICE |
| Device name | Amazfit T-Rex | Amazfit Stratos 3 |
| Device type | Fitness/Sport smartwatch | Fitness/Classic smartwatch |
| Gender | Men | Men |
| Release date | January, 2020 | September, 2019 |
| Predecessor | — | Amazfit Stratos |
| Successor | — | — |
| Versions | — | Amazfit Stratos 3 Elite Version |
| BODY | BODY | BODY |
| Dimension | 47.7 X 47.7 X 13.5 mm | 45.72 x 45.72 x 12.7 mm |
| Weight | 58g | — |
| Shape | Circular, Curved | Circular |
| Case material | Fiber-reinforced polymer | Glass Fiber, Polycarbonate |
| Strap material | Silicone | Silicone |
| Bezel material | Polymer | Stainless steel |
| Strap size | 22 mm | 22 mm |
| Screen protection | Corning Gorilla Glass 3 | Corning Gorilla Glass |
| Water resistance | Yes, 5ATM | Yes, 5ATM |
| Durability test | MIL-STD-810G | — |
| Swim-proof | Yes, recommended | Yes, recommended |
| Color | Black, Gray, Green, Khaki | Black |
| DISPLAY | DISPLAY | DISPLAY |
| Display size | 1.3 inches | 1.34 inch |
| Display type | AMOLED | LCD, Reflective |
| Display resolution | 360 x 360 pixel | 320 x 320 px |
| Pixel density | — | — |
| Always on | Yes | Yes |
| Custom watch face | Yes | Yes |
| Input type | 4 Physical buttons, Touchscreen | 4 Physical buttons, Touchscreen |
| CONNECTIVITY | CONNECTIVITY | CONNECTIVITY |
| Bluetooth | Bluetooth v5.0 | Bluetooth v5.0 |
| Bluetooth calling | No | No |
| GPS | GLONASS, GPS | BEIDOU, Galileo, GLONASS, GPS |
| NFC | (China only), Yes | (China only), Yes |
| Wi-Fi | No | Yes, Wi-Fi 802.11 b/g/n |
| MEMORY | MEMORY | MEMORY |
| RAM | — | 512MB |
| ROM | — | 4GB |
| Memory card slot | No | No |
| CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY |
| Technology | None | None |
| SIM type | None | None |
| Band | — | — |
| NOTIFICATIONS | NOTIFICATIONS | NOTIFICATIONS |
| SMS alert | Yes | Yes |
| Calls alert | Yes | Yes |
| Email alert | Yes | Yes |
| Event reminder | Yes | Yes |
| Third-party apps alert | Yes | Yes |
| MEDIA | MEDIA | MEDIA |
| Audio | No | mp3/mp4 |
| Bluetooth music | No | Yes |
| Loudspeaker | No | No |
| Microphone | No | No |
| Camera | No | No |
| Radio | No | No |
| SENSORS | SENSORS | SENSORS |
| Accelerometer | Yes | Yes |
| Altimeter | No | No |
| Ambient light | Yes | Yes |
| Barometer | Yes | Yes |
| Compass | Yes | Yes |
| ECG | No | No |
| Gyroscope | — | Yes |
| HRM | Yes | Yes |
| Pulse oximeter | — | — |
| Thermometer | No | No |
| Other sensors | — | — |
| ACTIVITY TRACKING | ACTIVITY TRACKING | ACTIVITY TRACKING |
| Blood oxygen | No | No |
| Blood Pressure | No | No |
| Calories | Yes | Yes |
| Distance | Yes | Yes |
| ECG tracking | No | No |
| Fitness Level | — | — |
| Heart rate monitoring | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Steps | Yes | Yes |
| Stress | — | — |
| Incidental fall detection | No | No |
| Menstrual cycle | No | No |
| VO2 Max | — | Yes |
| Swim-tracking | No | Yes |
| Swim-heart tracking | No | No |
| On-screen workout | No | No |
| Sport modes | 14, Yes | 80, Yes |
| BATTERY | BATTERY | BATTERY |
| Battery type | non-removable Lithium-polymer | non-removable Lithium-polymer |
| Battery capacity | 390mAh | 300mAh |
| Battery life | GPS: 20hrs, Regular: 20 days | Regular: 7 days+, Ultramode: 14 days |
| Charging type | 2-Pin charging | Charging dock |
| Charging time | 1-2 hours | 1-2 hours |
| Solar power | No | No |
| PLATFORM | PLATFORM | PLATFORM |
| Chipset | — | — |
| CPU | — | 1.2GHz dual-core |
| GPU | — | — |
| Operating system | Amazfit OS | Amazfit OS |
| MISC | MISC | MISC |
| Companion app | Amazfit Watch App | Amazfit Watch App |
| Compatibility | Android 5.0+, iOS 10.0+ | Android 5.0+, iOS 10.0+ |
| Payment system | Yes | Alipay |
| Interchangeable strap | 22 mm, Yes | 22 mm, Yes |
| Voice command | No | No |
| Find my phone | Yes | Yes |
| Box content | Amazfit T-Rex, Charger, Manual, Straps | Amazfit Stratos 3, Charger, Manual, Straps |
| Price | $139.99 | $176.99 |
Amazfit T-Rex vs Stratos 3: Which is Better?
Both the T-Rex and Stratos 3 are durable and sturdily built devices, fitness-focused with a long battery life that keeps you going longer. However, Stratos 3 is a far more sophisticated smartwatch. It features 8 Firstbeat algorithms which include Vo2 Max. that monitors your blood oxygen to ascertain your fitness level, recovery time that helps you plan better, and training load that shows the physiological impact of your training over time.
Moreover, the Stratos 3 comes with significant onboard storage that allows you to take your music along with you.
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