I have a VivoSmart HR+. I have only had it for a couple of weeks, so haven't really found a favorite feature yet.

I had one of the original Garmin fitness watches years ago (can't remember the model), and I LOVE my Forerunner 230. I've had it since Christmas, and I love that it keeps me accountable on moving around while at work. I'm not obsessed with "getting steps", but like that it does tell me to move if I've been sitting at my desk for a while. My last smart watch didn't have GPS built in, and I like having this on my wrist all of the time so when I take a walk at work, I have it logged. Also, before I received the 230, I used my phone to track my runs/walks, and the GPS was extremely inaccurate. Haven't found anything I don't like about my Garmin.