I'd pick Ronaldo. Initially I thought he was overdoing his trickery and making himself look really foolish because he was going nowhere. His game has since matured and he is beginning to play a little more direct now, much like dare I say Ronaldinho? Ronaldo used to be a very selfish player but has since begun to distribute the ball more. His game will continue to mature in the next couple of years with experience and I think he will be a more complete player than Robben.