Verdict: For Garmin device users, the HRM-Pro Plus is the obvious choice — running dynamics, advanced metrics, and seamless pairing make it the best companion to a Garmin watch. For non-Garmin users, or for athletes who want the most accurate HRM available regardless of ecosystem, the Polar H10 is the gold standard. Polar's accuracy edge is well-documented. Garmin's ecosystem integration is unbeatable.
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Winner: Polar H10
Spec-by-spec comparison
Garmin HRM-Pro Plus
Polar H10
Accuracy Rank
Top-tier (near H10)
Best in class (reference device)
Transmission
ANT+ + Bluetooth
ANT+ + Bluetooth
Running Dynamics
Yes (Garmin devices)
No
Onboard Memory
No
400 hours
Waterproof
IPX7
30m (swim-ready)
Battery Life
~12 months (1hr/day)
~400 hours active
Garmin HRM-Pro Plus
What works
Running dynamics (cadence, stride, oscillation, ground contact) on Garmin devices
Seamless deep integration with all Garmin watches
Simultaneous ANT+ and Bluetooth transmission
What doesn't
Running dynamics only work with compatible Garmin watches
No onboard memory — requires connected device to record
Less useful if you don't own a Garmin
Polar H10
What works
Most accurately tested consumer HRM by DC Rainmaker and peer comparisons
400-hour onboard memory — works without a connected device
Universal compatibility: Garmin, Apple, Wahoo, Zwift, and more
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