Apple Watch Ultra 4 vs Garmin Fenix 9 Pro: Both watches nailed my accuracy test
THE SO WHAT
When both Apple and Garmin clear the heart-rate accuracy bar in real-world tests, differentiation shifts from sensors to software, battery, and ecosystem lock-in. If you're building around wearables, assume baseline cardio data quality and compete on longitudinal insights and integrations, not raw signal capture.
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