Well mine would have to be the Plains.
The reason is that most of my friends are there and it has to be the most active map.
The only thing I would have to say I hate with the Plains is the bad tokens the map comes with.
I think my favorite map for me would have to be Ficho, and AI. Both places I always go to and I love both of them equally as well. Althought there are times where I go to plains just to see friends who stay in there, but I don't generally like going in cause it takes me forever to just get in and the lag is 2x worse there. I'm not saying plains is bad, it's honestly a beautiful map. But Caps, AI, or Ficho is where I'm at most of the time.