Amazfit T-Rex 3 vs Garmin Fénix 8 AMOLED 47 mm
Amazfit T-Rex 3 (42 h GPS, 68 g) vs Garmin Fénix 8 AMOLED 47 mm (47 h GPS, 59 g). Side-by-side spec comparison: battery, weight, maps, multi-band GPS and price. Which GPS watch should you buy?
AmazfitAmazfit T-Rex 3Ultra-rugged outdoor watch with dual-band GPS, offline maps and a 2,000-nit AMOLED display, at a mid-range price. 42 h in maximum-accuracy mode and up to 27 days in daily use. Military standard, 100 m water resistance and onboard music. Garmin Instinct-style toughness for far less.
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GarminGarmin Fénix 8 AMOLED 47 mmGarmin's flagship multisport watch: AMOLED display, topo maps, multi-band GPS, LED flashlight, speaker and microphone. 47 h in GPS mode (35 h multi-band) and 16 days in smartwatch mode. Rugged case with sapphire glass for mountain ultras and multi-day adventures.
View on AmazonSpec-by-spec comparison
| Spec | Amazfit T-Rex 3 | Garmin Fénix 8 AMOLED 47 mm |
|---|---|---|
| GPS battery | 42 h | 47 h |
| Multi-band battery | Yes | 35 h |
| Smartwatch | 27 days | 16 days |
| Weight | 68 g | 59 g |
| Maps | ✓ | ✓ |
| Multi-band | ✓ | ✓ |
| Music | ✓ | ✓ |
| Display | AMOLED | AMOLED |
| Price | Entry | Flagship |
GPS battery = each manufacturer's standard GPS mode; multi-band = dual-frequency (maximum accuracy). On Suunto, Polar Grit and Amazfit T-Rex the GPS figure already corresponds to dual-band mode. Figures verified against the manufacturer.
Verdict
For maximum autonomy on long ultras, Garmin Fénix 8 AMOLED 47 mm lasts longer in GPS mode. If you want the lightest watch on your wrist, go for Garmin Fénix 8 AMOLED 47 mm. On budget, Amazfit T-Rex 3 is the more affordable option.