Tough to say. They are both outstanding talents but based off current form I'll say Kaka. Ronaldinho does seem to be picking it up though based off his performance and goal against Villarreal.
Kaka is a great player but to this date he has never matched the brilliance and finess of a true demi god like Ronaldinho for a longer period of time. The only frame of time when Kaka was better was during the WC this summer and the beginning of this season but now Ronaldinho seems to be back to his old self again. Hundred years into the future people will still talk about the likes of Pele, Maradonna, Ronaldinho etc but from what Kaka has managed to do so far in his career he will not be mentioned together with those gods of football. He is young so I wouldn't be surprised if he develops into one though.
Kaka. Ronaldinho is more skilled, but while Kaka has slightly less flair and skill, he can play at a faster pace, and he sacrifices his body more physically.
will go with kaka. brazil coach Dunga recently said that Dinho is so overrated and depends on referees protection . kaka is the man
"Ronaldinho is the best but Kaka is better" Ronaldinho is widely acknowledged as the best player in the world, but I believe Kaka is actually better, primarily because he is more direct when he plays.
Kaka is a good player, but Ronaldinho is the sort of player who can do nothing all match then pull a trick out of the bag and win the game. Kaka needs to play all match to do what Ronaldinho does in thirty seconds.
They can both change a game, with there indivudual skill and passing ability, but which one is most influential to the players, judging by the way Barca have been playing, Ronnie has been doing that, and Kaka has by performing in Europe and trying to get Milan up the table. But i guess theres to many quality players for Milan and Barca to say that them two influence a game.