For Samsung's Gear S3, size matters. And that's a problem - CNET
Samsung Gear S3 Review: A Great Watch for Android Owners | Digital Trends
Amazon.com: Compatible for Samsung Gear S3 Frontier/Classic Case Bezel Cover, Metal Bezel + TPU Protector Bumper Case, Also Fit for 2018 Released Galaxy Watch 46mm/NOT for 2021 Galaxy Watch 4 Classic 46mm :
Samsung Gear S3 review: giving a full-on phone-on-a-watch a third go - CNET
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
Samsung Galaxy Watch v Gear S3: The key differences between the smartwatches - Wareable