In head 2 head games. Barca v Real, Barca v United. How many has messi won over ronaldo? And how often has Messi been the deciding factor. I don't know myself, I haven't checked. Just everytime I see the 2 clash it always appears to be Messi who provides the match winning performance.
I would argue that you cannot do head2head in that circumstance, how often have the rest of barcelona denied the RM players time and space to get the ball to Ronaldo and the RM players failed to stop the pass to Messi, football is a team game after all.