M a Real Madrid fan, but I don't think that Ronaldo is better than Messi.
Each one of them has his own features. Ronaldo is faster than Messi, his kick is stronger, he knows very well where to be centered, but he needs spaces in order to make his dodges.
On the other hand, Messi's kick is more focused, he can make dodges in very small spaces, and he is more expert in team playing than Ronaldo.