Yeah I only had option to use Samsung as default I didn't know you had to go to Google and get it for your watch. So I had it for both but I had issues replying with the mic on GM it just kept saying initalizing and than tap again it wouldn't bring up for me to speak like SM did so I switched back.
When you mean having it as a tile do you mean having it in your app drawer when you swipe up or when you scroll to the left to see your shortcuts cause I went to add and didn't see it as an option there. I know Wear OS refers to tiles but I wasn't sure if that was the apps when you scroll up.