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Amazfit T-Rex 3 vs Garmin fenix 9 (47 mm)
The specs that matter for triathlon, side by side, from each maker’s own published figures.
| Spec | Amazfit T-Rex 3 | Garmin fenix 9 (47 mm) |
|---|---|---|
| GPS battery | 42 h | 30 h |
| Smartwatch battery | 27 days | 16 days |
| Triathlon / multisport mode | Yes | Yes |
| Onboard maps | Yes | Yes |
| Open-water GPS (our rating) | 5 / 5 | 5 / 5 |
| Weight | 68.3 g | 75 g |
| Screen | AMOLED | AMOLED 454x454 |
| Price | See retailer | ~$999.99 |
Open-water GPS is our 1–5 rating from the satellite systems each maker lists: multi-band receivers score 5. Everything else is the maker’s own figure.
Which should you pick?
Amazfit
Pick the T-Rex 3 if…
- you want the longer GPS battery: 42 h vs 30 h
- you want the longer smartwatch battery: 27 days vs 16 days
- you want the lighter one: 68.3 g vs 75 g
Garmin
Pick the fenix 9 (47 mm) if…
On the specs above it doesn’t pull ahead, so choose on fit, feel or price.
Check price →Specs from the makers’ own pages: Amazfit, Garmin.
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Triathlon Watch Comparison
Battery life, open-water GPS and maps across the watches triathletes buy.
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Triathlon watches, compared
Every product in this category in one spec table, plus 820 head-to-heads.
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