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
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Samsung Gear S3 Frontier: Why Not Galaxy Watch? - YouTube
Samsung Gear S3 - Wikipedia
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Samsung Gear S3 Frontier Review: Why It's (Almost) the Best Smartwatch | Tom's Guide