General usage of a Android watch

Hi friends,
what is your general usage of an android watch.
I am wondering if eg. somebody uses sim (lte, 3g or 4g) addtionally to the mobile phone (what about whatsapp and twice installing it with same mobile number ist not possible).
And i am asking myself if i compare such (for me good android watch) with something like Huwai GT or Stratos where th mobile apps are much more providing informations like the apps from a chinese watch (eg wiiwatch2).
I am not comparing them with regards of function…only usage (see in mobile phone the steps, sleeptracker, frequently heart rate…and so on).
I haven’t seen this function in an android watch so far…
Thanks a lot for some informatioen
Regards
Hans