Its enough to say that the WHOLE world, including everyone who seen them both live weekly, are even comparing them SERSIOUSLY, says everything about the insane level of talent Messi has (and yeah Maradona saying it himself says alot, considering the kind of guy he is, not exactly a bullshitter or type who wants to share ze glory too easily).
Cristiano is a hyper functional super player, great one, and will surpass lots of modern greats in due course in his own way, but saying with all due respect to him, based on their careers and talent shown so far, he is not comparable to Messi in overall, talent and heights they can reach. Defenitely comparable in overall top of the world level they hold rather exclusively (its not like Maradona was alone in that level and so undisputed all the time, there were Zico's Platini's etc, just like Pele had Garrincha's and et al), but which one is the better one should really obvious for all .
For me, seasons doesnt say anything in itselfs, for years its been obvious to me Messi is better then Cristiano, even that insane season Cristiano had 2 years ago, I didnt think Ronaldo is better (as in overall), but that he has a better season more or less. Messi has been held back injuries (3 first years of his career), and being in the shadow of Ronaldinho too much. Read a real candid interview of how R80 is his best budd, and how he felt it was fun but also very relaxing to know playing with him meant you could rely on him, Messi since then has taken obvious leaps and thats due to the responsibilities he has to take as the main man, evolved as a player, decision making, how he goes for goals, and assists (used to not score much, but also not pass much, dribbled everyone, but never had a real sense for when to not overdribble).