Those watches only work well with android,the Felix series works equal with android and iOS devices.
Considering OP has the Apple Watch, that is the best iOS smart watch companion since it's fully immersive into the ecosystem. Though, a dual mobile OS watch does give options. There is Android Wear, Fitbit, amongst others.
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I got a Gear S3 Frontier the same day i got my S8+. So far it's a rock solid performer. The battery life embarrasses the hell out of Apple Watch.
It's also worth saying I think Samsung Health is better than Apple healthkit.
It took me about a day or two of use to dial in the settings to where I was content. It's got quite a few configuration options.
It's a big Watch though. You'll need at least medium sized wrists to pull it off.
The bezel interface is the best in the industry. Samsung knocked it out the park. LTE and GPS are great additions as well.
Considering what the AW Series 1 and 2 are, it's not hard to surpass Apple's latest iterations. A circular design, LTE/GPS combo, carriers supporting the device with plans, Samsung Pay. What's not to like?