High availability Active - Active OR Active - Passive

I'm planning on building a HA solution with 2 MFT server. from what I can read is that the HA solution will be based on Active - Active. is that correct understood?

Also when doing a search on this topic, i found 2 different description (ways) on how to do the HA.



what is the correct way or how have you build the HA part? 

how is the user management done with a HA solution, are the users/configuration copied from one host to the other when ever there is some changes?