Now more goals doesn't necessarily mean better player because no doubt, Ronaldo is the best goal scorer football has ever known, no doubt about that! But better player? Messi. Players like Zidane weren't known for goal scoring but you can't doubt his talent, so much that Sir Alex Ferguson notably said:"Give me Zidane and 11 pieces of wood and I'll win you the Champions League!"

Most goals - Cristiano Ronaldo 53 in which 0.38 goal per game was vs top teams and 1.10 vs non top team
Messi 0.83 vs top teams and 1.01 vs non top teams
Most assists - Messi 26
Most goals directly involved - Messi 76 - Ronaldo 69
Most dribbles - Messi (Ronaldo is not in top 50)
Most key passes - Messi (Ronaldo is not in top 50)
Most through balls - Messi (Ronaldo is not in top 200)
Most MOTM awards - Messi
Most goals in finals - Messi
Most penalties - Cristiano Ronaldo
Most solo goals - Messi (Ronaldo had the most one touch goals in Europe
(penalties, tapins) 95% of his goals
Most pre assisted goals - Messi
Most goals after dribbling - Messi (Ronaldo had only two goals after dribbling JUST one player)
Most weak foot goals - Messi (they say CR7 is more complete haha)
Most out of the box goals - Messi (they say CR7 has more long range goals)
Best graded player in the world for 2015 according to all
statistical analysis: Messi

So how is Ronaldo comparable to Messi?
(sources: Squawka, Who scored, OPTA football Stats)