It's even better than that, that was the biggest argument and probably still is but the two of them didn't play at the same time, these two have played at the exact same time, in the same league, same competitions, putting up insane numbers, with a level of consistency and peak longevity rarely ever seen (They would definitely be the greatest in that regard). Insane how they absolutely make each other so much better by pushing the limit again and again, everytime you think one of them is done now they come back again with a bang. It's easily the greatest individual rivalry the game has ever seen, it could be a decade with no one outside them winning the Ballon D'or, which is absolutely insane. There was a 9 year gap between Ronaldo winning his first Ballon D'or and his 4th, which again, is mental. As great as past players were, don't think anyone ever sustained their absolute top level for so long while constantly being in the top 2 in the world for a decade. Something that usually gets overlooked in the light of 'peak ability' but that for me is a far bigger factor in defining greatness.