In addition to what Markoff said, I recommend sticking with the original Bip or Bip Lite; nothing else, including other Bip models. Only those two give you access to [the world's largest library of watch faces](https://amazfitwatchfaces.com/bip/fresh).

I like Bip so much that when it failed (because of a design flaw fixed in Lite and later Bip models), I bought Bip Lite (since I never used Bip's GPS, always using the phone's instead).