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Both watches nail the basics: accurate multi-band GPS, reliable heart rate and rugged builds you can take anywhere. The differences that actually decide the purchase are battery, training depth and ecosystem — and they're big.
The pick if you run 3-5 times a week and live in the Apple ecosystem. The 3000-nit display is unbeatable in sunlight, dual-frequency GPS tracks tight city streets accurately, and the health suite (ECG, SpO2, temperature, blood-pressure trends) is the most complete on any wrist. The catch: you'll charge it every day or two.
BatteryUp to 42 h (72 h low power)
GPSDual-frequency L1/L5
Best foriPhone users, everyday runners
Price849€
The pick if training is the point. Garmin's training load, readiness and recovery metrics go far deeper than Apple's, the buttons work with sweaty fingers and gloves, and solar charging stretches battery life to weeks — marathon blocks, ultras and multi-day mountain trips without a charger. Works equally well with Android and iPhone.
BatteryUp to 48 days with solar
GPSMulti-band GPS/GLONASS/Galileo
Best forHigh volume, ultras, Android users
Price771€
The verdict, by runner type
You run to stay fit (iPhone)Apple Watch Ultra 3
You follow a training planGarmin Fenix 8 Solar
Marathons / ultras / trailGarmin Fenix 8 Solar
You want one watch for everythingApple Watch Ultra 3
You use AndroidGarmin Fenix 8 Solar
You hate charging thingsGarmin Fenix 8 Solar
Frequently asked questions
Is Apple Watch or Garmin better for running?
For most runners with an iPhone, the Apple Watch Ultra 3: great GPS, complete health tracking and the best smartwatch features. For high-volume training and ultras, the Garmin Fenix 8 Solar: weeks of battery and deeper training metrics.
Which battery lasts longer?
No contest: the Garmin Fenix 8 Solar lasts up to 48 days with solar charging versus up to 42 hours (72 in low power) for the Apple Watch Ultra 3.
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