Can't really say there's much that Melo's better at.
Inler is better in possession (calmer on the ball, better decision making, holds the ball better), better offensively, less prone to doing something retarded like jump kicking a guy in his throat or chipping a back pass to Motta. Not much between them defensively, can't really say one's better. Melo's better at being nuts and creating excitement and causing panic to both teams.