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
Amazon.com: Compatible for Samsung Galaxy Watch 3 45mm Band - Gear S3 Frontier & Classic Bands/ Galaxy Watch 46mm bands, 22mm Soft Silicone Replacement Black Bands Sports Straps Breathable Men and Women :