Although, really, they don't have much in common beyond what you pointed out when you compare their careers. Pacino's was and still is much more stage oriented than De Niro's, who has never acted in a play. Pacino also started out doing comedy. I think what hurts Pacino is because he was an overnight success with the Godfather, people expected him to be some version of Michael Corleone and never really gave him a chance at other work.
If you haven't already seen it, check out Pacino's boxed set "Al Pacino: An Actor's Vision". These are three movies (two based on mostly unknown plays, one Shakespeare's King Richard III) plus a documentary of sorts that he financed. It will give you a lot of insight in to what he has done on both film and theater.