[Legend killer]

Maybe last year but a Ronaldo on top form is a bigger threat than Messi , he offers the aerial presence that Messi cannot. Another thing you have to consider is that Messi plays in a joke of a league ( so does Ronaldo now but he is proven in the PL) where the defenders don't even try to tackle you , i personally feel that Messi would struggle a lot in the PL because of the physical side to it.

Also Messi at Barca has in Iniesta and Xavi the best CM's in the world, aswell as having most of the top players in the world in his team Ie: Villa etc so it is not exactly hard to be a great player when you have a team like that.