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?
Amazon.com: Garmin 010-01769-01 Vivoactive 3, GPS Smartwatch with Contactless Payments and Built-In Sports Apps, Black with Silver Hardware : Electronics
Amazon.com: Anrir Watch Bands for Vivoactive 3,20mm Silicone Bands for Garmin Vivoactive 3/Forerunner 645 Music/Galaxy 42mm/Galaxy Watch 3 41mm/Galaxy Watch Active 2 40mm/44mm-Army Green : Cell Phones & Accessories