I just upgraded to Samsung series 4 (44mm) from the Garmin Vivoactive 3. The watch faces are the same size, but the band for the Garmin is way more comfortable and fits
Garmin Vivoactive 3 vs Samsung Galaxy Watch: What is the difference?
Hat Prince Garmin Vivoactive 3 Trainer Screen Protector - 2 Pcs.
Compare Garmin vivoactive 3 Music vs Samsung Galaxy Watch 4 44mm - Garmin vivoactive 3 Music vs Samsung Galaxy Watch 4 44mm Comparison by Price, Specifications, Reviews & Features | Gadgets Now
Amazon.com: Fintie Compatible with Garmin Vivoactive 3 /Vivoactive 3 Music / Venu Sq / Venu 2 Plus Watch Band, Samsung Galaxy Watch 42mm/Galaxy Watch 3 41mm/Galaxy Watch Active 2 40mm/44mm, 20mm Solid
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Garmin Vivoactive 3 Specifications, Features and Price - Smartwatch Charts