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
Amazon.com: Compatible with 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 :
Samsung Galaxy Watch vs Gear S3 in pictures - SamMobile
Amazon.com: Seizehe Stripe Band Compatible for Compatible for Samsung Galaxy Watch 46mm Bands/Gear S3 Frontier Band, Galaxy Watch 3 Bands 45mm,22mm Designer Sport Strap Silicone Bracelet Replacement for Men Women(Army Green Red) :