>>> FF4 I guess, as someone posted here there's no customization in 4.. well, at that time rpg games/battle systems were still in diapers so i cant complain either.
I think the older FFs are pretty decent.
ff3 had the character classes, in ff2 I really liked the leveling up system, and ff1 allowed you to choose your party from the start (a pretty good idea if you ask me)..