Gear S3 Frontier vs Galaxy Watch3 - Technically it's a marginally thinner but smaller housing, narrower bezels, and weighs significantly less. It feels thinner than it looks, maybe due to the back
Apple Watch 3 vs Samsung Gear S3 Frontier – MBReviews
WITHit Band Kit for Samsung Galaxy Watch 46mm, Gear S3, Gear S3 Frontier, and Fossil Sport Woven Black/Bluestone/Black 52374BBR - Best Buy