Apple’s Ultra 3 and Garmin’s Fenix 8 Pro cater to outdoor enthusiasts and athletes, but they differ significantly in battery life, display quality, and specialised features, offering distinct choices for serious users.
Apple’s Ultra 3 and Garmin’s Fenix 8 Pro are among the most capable rugged watches on the market, but they are built for different buyers. Stuff says both are aimed at serious runners, endurance athletes and outdoor users who want premium displays, advanced navigation and emergency tools in a hard-wearing case.
The clearest divide is battery life. Garmin’s top-end Fenix 8 Pro is the stamina leader, with Stuff reporting up to 27 days in smartwatch mode and as much as 80 hours with GPS use and heart-rate broadcasting. By contrast, the Apple Watch Ultra 3 is rated for about 42 hours of mixed use and around three days in low-power mode. For anyone heading away from a charger for more than a weekend, Garmin has the stronger case.
Display quality is another point of contrast. The Apple Watch Ultra 3 uses a 49mm titanium case with a 3,000-nit OLED screen, while the Fenix 8 Pro’s microLED version reaches 4,500 nits and is described by Stuff as the brightest outdoors watch it has tested. Garmin also offers an AMOLED version at a lower price. Apple’s panel is still more than bright enough for most conditions, but Garmin has the edge in direct sunlight.
Both watches lean heavily into safety and outdoor navigation. Garmin includes LTE calling, messaging and live location sharing, plus satellite SOS through an InReach subscription, while Apple offers satellite emergency messaging at no extra cost. The Apple Watch also adds fall detection, crash detection, an 86-decibel siren, offline maps and Backtrack route recovery. Garmin counters with a built-in torch, red emergency light and dive certification to 40 metres. Apple’s Ultra 3 is rated to 100 metres for water resistance, though it should not be used deeper than 40 metres.
Fitness tracking is excellent on both, but Garmin is the more data-heavy platform. Stuff notes that the Fenix 8 Pro provides metrics such as Body Battery, Training Status, Recovery Time, Training Load, VO2 Max, heart-rate zones and sleep scoring, alongside ECG support and AI-assisted insights through Garmin Connect+. Apple’s Ultra 3 is easier to use and better integrated with the wider smartwatch experience, with workout features such as Workout Buddy, Race Route and multisport auto-transitioning, plus health tools including hypertension alerts, sleep apnoea alerts, ECG and blood oxygen readings.
That broader smartwatch polish is where Apple still stands out. It works best with an iPhone, but that integration brings Apple Pay, Music, Podcasts and a wide app ecosystem. Garmin’s software is more specialised and, for some users, less central to the experience. Stuff also points out that the Fenix’s extra smart features may be secondary to its sport-focused tools rather than a main selling point.
Price may settle the decision as much as any technical specification. The Apple Watch Ultra 3 starts at $799 / £749. Garmin’s Fenix 8 Pro begins at $1,200 / £990 for the 47mm AMOLED model and rises to $1,700 / £1,400 for the 51mm microLED version. For most buyers, Apple looks like the better all-round smartwatch, while Garmin is the stronger choice for battery life, outdoor resilience and advanced training data.
Disclaimer: This content is intended for informational purposes only. Readers are advised to exercise their own judgement, conduct due diligence, or consult a qualified expert before acting on any information provided.
