July 31, 201312 yr Out of the ones available I would say Agrabah cause you can get to high leveled enemies quickly going 2 screens to the right to grind on. Though at the level I'm at now Dwarf Woodlands has large bodies and those level 50 heartless all stacked on each other to use so I rotate unless I have missions.
August 1, 201312 yr Wonderland so far. I really like the platforming. But I'll be glad when they update with more worlds.
So far out of the three worlds mine would have to be Wonderland