Ronaldinho's prime has been much much shorter than Ronaldo's IMO. I don't think he is even the best player on his own team anymore as I would in all likelyhood take Messi over him. I truely don't think I have seen a player dominate a game they way Ronaldo did for the past 15+ years. Ronaldo was the complete striker, size, power, speed, strength, ect. He could beat you anyway possible. I think his complete skill was pretty much hidden in the role he served on every team. He never had to do any of the things that Ronaldinho. Its pretty much just a choice of personal preference. I don't think you could really go wrong with either choice. If I had to pick I would take Ronaldo.