V2 lets you retain configs on future upgrades. V2 is a complete rewrite from the bottom up, that's why you can't import the old configuration. V2 has a lot of new functions and is around 2x as fast as V1. There is a v2 template in CA Apps you can use. And setup is very similar to V1, just copy paste you api keys ect. takes 15 mins if you're slow.
And I don't know anything about muximux or Heimdall other that muximux is inferior, and Heimdall is not really exactly the same type of application.