I know is very hard to compare players who not play in the same time. To make it less hard is we have to look how he is (in theses case "was") worth for his team, how his idea effect the game. If you said, "present game are much harder than the old days, and bla bla bla stuff", we could easily said "ahh, robben or malouda is much better than cruijff", "modric? he's much better than maradona".
What zidane could do with a ball on his feet, maradona could done the same with an orange fruit. And for pele, he was also the greatest. Though the truth is he "only" won WC twice. WC '62 was garrincha's WC, pele was injured. And for consideration, pele....pele never been brazil's captain in WC. Cause, for the team, there are others brazil stars who had more leadership than him.
And also "pele was more lucky than maradona cause brazil had players who could back pele up, like in WC '62. And for WC '70, i don't know if brazil could won it if pele is out injured, but that brazil's team were considerably as the best team ever exist in football. As for maradona, he didn't had that kinda luxury, he won WC by himself".