The Samsung Gear S3 is on par imo.
You have owned a Apple Watch?
I have... I still own one and wore it for 2 years daily and used it quite heavily. When I moved to the Note 8, I was fully expecting that the lack of a smartwatch was going to be one of the things that pulled me back to Apple eventually. I got a Gear S3 Frontier when I got the Note 8. It took me just a week or so to find that I liked the Gear S3 better than AW in many ways.
First, the user interface and rotating bezel are so much better than AW's somewhat kludgey interface. They improved it, but still not nearly as intuitive. I use these in the gym and when running, and with sweaty fingers I found the AW very frustrating, and the Gear S3 is way better in this setting. The other things I really like for the S3 are its sleep tracking, the health app, Samsung Pay (works in more places in the US), taking calls/messages, being able to have a keyboard for inputting if I need it, and streaming / preloading Spotify. I also like the look and feel of it way more because it looks like a real watch, and I can load different watch faces.
The things I don't like... complications are really the only thing I miss. If these were better done on the S3, I'd be happy. As for Apps, there are way fewer which is unfortunate, but 95% of what I really use are the things that came with it. On the AW, most of the apps that I used were more novelty than anything because I generally had my phone and could do it just as easy, if not easier, on the phone.