Apple Watch 11 vs Garmin Fenix 8: Which GPS Watch Should You Buy?

Overview

The Apple Watch 11 is a lifestyle smartwatch with fitness features built in, aimed at iPhone users who want health tracking alongside notifications and apps. The Garmin Fenix 8 Pro is a dedicated endurance and adventure sports watch priced around $1,000, targeting serious athletes who need multi-day battery life and deep training tools. These two devices serve fundamentally different users, and the price gap alone ($399 vs $1,000) tells most of the story.

Specs at a glance

Price: Apple Watch 11 starts at ~$399; Garmin Fenix 8 Pro starts at ~$1,000
GPS: Both use multi-band GNSS; Fenix 8 Pro adds inReach cellular messaging on the Pro tier
Battery (GPS mode): Apple Watch 11 approximately 18 hours standard; Fenix 8 Pro targets multi-day use (exact GPS hours not fully confirmed in available sources)
Heart rate sensor: Both use wrist optical PPG (blood volume via LED light); Apple Watch 11 adds an ECG electrode for electrical heart rhythm capture
SpO2: Both include optical SpO2; Apple Watch 11 availability varies by region due to patent restrictions
Water resistance: Apple Watch 11 rated 50m; Garmin Fenix 8 Pro rated 100m
Weight: Apple Watch 11 approximately 39g (41mm aluminum); Garmin Fenix 8 Pro weight not confirmed in available sources
Display: Both AMOLED; Apple Watch 11 peaks at 2000 nits

GPS and tracking accuracy

Both watches use multi-band GNSS, which improves accuracy in urban canyons and under tree cover compared to single-band systems. However, head-to-head testing by The5kRunner comparing the Fenix 8 Pro against the Apple Watch Ultra 3 found the Garmin losing on satellite and connectivity performance in every respect tested. That finding is significant because the Fenix 8 Pro is Garmin's flagship outdoor watch and is expected to lead in this category. The Apple Watch 11 uses the same multi-band GPS hardware as the Watch 10, so no meaningful accuracy improvements are expected over that generation. Neither device stands out as a clear winner here based on available data, and the Fenix 8 Pro's edge in raw satellite performance appears smaller than its price premium suggests.

Battery life

This is where the two watches diverge most sharply in practical use. The Apple Watch 11 delivers approximately 18 hours in standard mode. For a marathon runner or long-day hiker, that is tight. It falls well short of competitors like the Garmin Forerunner 965 (31 hours GPS) and Coros Pace 3 (38 hours GPS). The Fenix 8 Pro is designed for multi-day use, which makes it a fundamentally different tool for anyone doing overnight trips, ultra-distance events, or multi-day adventure races. Exact GPS hours for the Fenix 8 Pro are not fully confirmed in current sources, which is a gap in this comparison, but Garmin's published targets for the Fenix 8 series are significantly higher than 18 hours. If battery life is your primary concern, the Fenix 8 Pro wins by design, though you are paying a large premium for it.

For athletes: who wins?

Running (road, under 4 hours): Apple Watch 11. The 18-hour battery is sufficient, the GPS is accurate enough, and the health tracking integrates well with iPhone. The Fenix 8 Pro is overkill at twice the price or more.
Trail and ultra-distance: Garmin Fenix 8 Pro. Multi-day battery, barometric altimeter, and inReach messaging on the Pro tier make it the practical choice when you are far from a charger and potentially out of cell range.
Triathlon: Garmin Fenix 8 Pro. Dedicated triathlon mode, longer battery for iron-distance events, and 100m water resistance give it the edge over the Apple Watch 11's 50m rating and shorter GPS endurance.
Recovery and daily health tracking: Apple Watch 11. ECG, HRV, skin temperature, and tight iPhone integration make it the stronger daily health device for most people. The Fenix 8 Pro has similar sensors but is heavier and less practical as an all-day wear.

Verdict

For most people, the Apple Watch 11 is the right choice. It costs $399, handles everyday fitness tracking well, and integrates deeply with iPhone. The Garmin Fenix 8 Pro costs roughly $1,000 and is built for a specific user: someone doing multi-day adventures, ultra-distance events, or remote expeditions where battery and satellite communication matter. That user exists, but they are not most people. The Fenix 8 Pro's GPS performance advantage has also been questioned in independent testing, which weakens the case for its premium further. Buy the Apple Watch 11 if you are an iPhone user who runs, swims, and wants solid health tracking. Buy the Fenix 8 Pro only if you genuinely need multi-day battery life or backcountry communication features, and consider whether the Coros Apex 2 Pro at less than half the price covers your needs first.