I was on Samsung devices (S3, S4, S5, Note) before moving to Pixel, and at that time, I found those apps crap. The Note was a corp phone, so no rooting; I had to live with Old Android + Samsung Crap + AT&T Crap.

I recently got the S Health app to pair with my smartwatch, and it's pretty good. The apps on the watch itself are decent as well.