Rasmus is well above Maybin at this point.
Maybin hits the ball on the ground way too much. I couldn't find the statistic, but I'm very certain his Line Drive% is close to 10, which is a very low number. He certainly has all the "tools" you look for in a player to rise to a very high level, and his ceiling is as such, but I have no reason to believe he will ever reach it. Regardless, he is a top 10 talent.
Rasmus raked, and suffered a pretty bad illness this year that did affect his play to a degree. He is better in every way up against Maybin. He is right behind Jay Bruce for the top prospect spot.