Garmin Fenix 8 offers dive capabilities, speaker/mic, and LED flashlight at $999 MSRP while Polar Vantage V3 provides dual-band GPS, offline maps, ECG, and 150+ sport profiles at $600 MSRP. Garmin leads in specialized features and current status per 2024-08 release; Polar delivers stronger value and battery emphasis. Garmin wins overall for users needing dive and mapping.