Bottom line up front: Apple Watch is the better everyday health tracker. Garmin is the better running computer. If running performance data matters to you, Garmin wins — it’s not close.
Two Very Different Tools
The Apple Watch SE and Series 9 get sold to runners constantly. They’re great smartwatches with solid fitness features. But compared to a purpose-built running watch like the Garmin Forerunner 265, they’re a different category of product — and the gap in running-specific data is significant.
This isn’t a knock on Apple Watch. It does a lot of things brilliantly. But if you run seriously — tracking pace zones, VO2 max trends, training readiness, ground contact time — Garmin is built for you in a way Apple Watch simply isn’t.
Head-to-Head
| Feature | Apple Watch S9 | Garmin FR265 |
|---|---|---|
| GPS accuracy | Good | Excellent |
| Battery (GPS on) | ~7 hours | ~20 hours |
| Running dynamics | Basic | Advanced |
| Training load / HRV | Limited | Full system |
| Smartwatch features | Best in class | Basic |
| Requires iPhone | Yes | No |
| Price | $399–$499 | $449 |
GPS and Route Tracking
Apple Watch Series 9 has dual-frequency GPS and it works well for most recreational running. You’ll get accurate pace and distance in open areas. It starts to drift in urban canyons or dense tree cover — a known limitation of wrist-based GPS in reflective environments.
The Garmin Forerunner 265 uses multi-band GPS (GPS + GLONASS + Galileo simultaneously) and is noticeably more accurate in complex environments. If you run in cities, trails, or anywhere with overhead obstruction, the difference is real. Route maps are sharper and pace data is more stable.
Battery Life: Not Even Close
Apple Watch Series 9 gets roughly 6–7 hours of GPS tracking before it dies. For most runners that’s fine — but it rules out marathons, ultras, or any long day on the trails. You also need to recharge nightly just for daily wear.
The Forerunner 265 gets up to 20 hours in GPS mode and around 13 days in smartwatch mode. You charge it every 4–5 days. For anyone racing long or doing back-to-back training days, this isn’t a minor edge — it’s the difference between a watch that makes it to the finish line and one that doesn’t.
Training Intelligence
This is where Garmin separates itself most clearly. The Forerunner 265 tracks VO2 max trends, training load (aerobic vs. anaerobic), training readiness, race predictor times, and daily suggested workouts based on your recent history. It measures running dynamics like cadence, stride length, ground contact time, and vertical oscillation. It tells you how long you need to recover after a hard session.
Apple Watch tracks heart rate zones, estimates VO2 max, and logs workouts accurately. It does not have a training load system, does not give suggested workouts, and does not track running dynamics without an external sensor. For casual runners, that’s fine. For anyone building toward a race, it’s a meaningful gap.
Where Apple Watch Wins
Everything else. Apple Watch is a far better daily companion — notifications, Apple Pay, Siri, app ecosystem, health features like ECG and crash detection. If you run 3x a week and also want a smartwatch the rest of the time, Apple Watch is the better choice. It integrates with iPhone seamlessly in a way Garmin never will.
Who Should Buy Which
- Buy Apple Watch if you run casually 2–4x a week and want a full-featured smartwatch the rest of the time
- Buy Apple Watch if you’re deep in the Apple ecosystem and want seamless integration
- Buy Garmin if running is your primary sport and you want the most detailed training data available
- Buy Garmin if you run more than 2 hours at a time, or race at any distance
- Buy both if you want Garmin for training and Apple Watch for everything else — many serious runners do exactly this
Where to Buy
From $449 — free shipping with Prime
Where to Buy
Best all-in-one fitness smartwatch for iPhone users
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Reviewed by
Sara Okonkwo
Running & Endurance
Hobby runner with a dozen half marathons and one very humbling full marathon. Covers running watches and GPS wearables with a focus on what actually improves training — not just what looks good on a wrist.
Running Analytics: Where Garmin Pulls Ahead
For structured running training, Garmin’s analytical depth is difficult to match. The Forerunner series provides real-time Running Dynamics (cadence, vertical oscillation, ground contact time, stride length) when paired with a compatible accessory — data that reveals inefficiencies in running form that pace and heart rate alone cannot surface. Training Effect breaks down each session’s aerobic and anaerobic benefit, telling you whether a workout built your base, improved your threshold, or developed speed. Race predictor gives estimated finish times for 5K through marathon based on current fitness, recalculated after every run.
Apple Watch gives you pace, distance, heart rate, and elevation — the standard metrics that every running watch provides. The Workout app is clean and reliable. Third-party apps like Strava and Nike Run Club add structured workouts and coaching. But the native analytics layer stops well short of what Garmin provides: there is no training load analysis, no VO2 Max trending visible in the workout app (it appears in Health app data but is less prominent), and no equivalent to Garmin’s Training Status that tells you whether your fitness is improving, peaking, or declining.
GPS Accuracy on the Run
Independent GPS accuracy testing consistently ranks Garmin at the top for running GPS accuracy, particularly in challenging environments. The Forerunner 265’s multi-band GPS (L1+L5 dual frequency) produces clean route traces in urban canyons, under tree canopy, and in stadiums — environments where single-band GPS struggles. Apple Watch Series 9 uses L1+L5 as well and performs comparably in most urban running environments. The gap is smallest in open conditions (roads, tracks, parks) and largest in dense city environments and forest trails.
For practical training purposes, both are accurate enough that the difference rarely matters for pace tracking and route logging. Where the gap is noticeable: automated lap splits in GPS-challenging environments (a track inside a stadium, a route through downtown Manhattan) tend to be more accurate on Garmin. For most recreational runners training in typical suburban and urban environments, both devices will give you distance and pace data you can trust.
Training Plan Integration
Garmin’s ecosystem supports structured workout sync — training plans from Garmin Coach, TrainingPeaks, and Garmin’s Connect marketplace can push specific interval workouts directly to your watch. During a run, the watch beeps and vibrates when you should change pace, automatically tracks your intervals, and tells you when your rest period is over. For runners following a coached plan or a structured training program, this guided workout functionality changes the experience of executing complex sessions.
Apple Watch supports structured workouts through third-party apps — the Workout app itself does not have a native interval timer in the same depth as Garmin. Nike Run Club and TrainingPeaks have Apple Watch apps that enable guided runs, and the Apple Watch Ultra 2’s Action Button can be used to manually advance through intervals. It works, but the native experience is less polished than Garmin’s built-in workout guidance, which requires no third-party app for most standard interval formats.
Frequently Asked Questions
Which is better for marathon training?
Garmin is better for structured marathon training — it delivers daily suggested workouts calibrated to your current fitness, tracks training load across the full 16-20 week plan, and provides race predictor times that update after every run. Apple Watch tracks every run accurately but lacks the coaching layer. If you are following a coach’s plan in TrainingPeaks, Garmin’s native integration delivers each workout to your wrist automatically.
Can Apple Watch replace a Garmin for serious running?
For recreational runners doing 15-30 miles per week without a structured plan, Apple Watch Series 9 is fully adequate. For athletes following periodized plans, tracking training load, or doing structured interval work where precise pacing guidance matters, Garmin provides tools Apple Watch lacks natively.
The Bottom Line
For most recreational runners with an iPhone, Apple Watch Series 9 is excellent and more than adequate. For athletes following structured training plans, doing intervals that require precise pacing guidance, or wanting the deepest training analytics available at the consumer level, Garmin Forerunner 265 is the stronger running tool. The most common regret pattern: runners who buy Apple Watch for the smartwatch features and later wish they had chosen Garmin for the training depth. If running performance is the primary goal rather than wrist computer functionality, buy the Garmin first.
The right decision comes down to your specific training goals, device ecosystem, and budget. Use this guide as a framework, not a formula — every athlete’s situation is different, and the device that serves your specific combination of needs is the one worth buying. If you are still undecided after reading, the safest starting point is always the device with the lower cost of entry: you can always upgrade once you have identified the specific gaps your current tool is not filling.