1) just pick one
2) just pick a different one that gets fixed faster than that first one when it breaks
3) just pick one that you know boots nazis ASAP
4) just pick one with a cute or fun admin
5) just pick one with emojis you like
6) just pick one with a pretty theme
7) just pick one with a site name you like pronouncing
8) it really doesn't matter that much
Most active users will follow you when you move if you change your mind later. I promise.