Actually Messi is more like Zico, Best or even Cruyff. Of course he has some Diego in him, like Diego had some Sivori in him, but even with similarities, they had their differences.
There is a lot of context regarding stats, from roles, injuries, timing etc etc that would always affect the end result, but for instance even without entering in such terrain, there was an artistry and level of touch, passing, strike in Diego that pretty much can be considered more talented than anyone, Messi included.
Of course we are not talking about huge gaps, but there was a what we can call a relationshipo with the ball with Diego that was in my view at moments, was beyond surreall.
And I'm not talking about malabarism, tricks and stuff, that sometimes are done to even disguise the lack of capability to resolve a play with more speed, assertion and better reading and management of time and space, since it's not always a display of more talent (pretty common misconception with certain plays that Ney, RG, Djalminha, Di Maria, or even "lesser names" like Okocha, Pastore, etc when they pull out some fantastic and enjoyable magic.
I'm, talking about all that entertaining stuff, combine with an assertion and off the charts level of understanding/reading, timing and manage of time and space. All this in combination with a very in your face (and not pour le galeire or sellfish apporach) character and leadership made him a very very special player and so enjoyable to watch.
BTW I'm not in the Diego did it all alone, Diego did it with the worse teams, etc..so that it's more significant, or that his era was way better or let's say way harder...nope I do not endorse any view as taxative as that (nor the opposite version to all those). Yet it has to be take in account how his carreer developed to understand an see how that also affected his numbers, even his njuries and off the pitch affairs.