I think Pacino is the better of the two. No disrespect to DeNiro, he is one of the best. But I just think that Pacino can truely "make his character come alive" better. For example, the first movie of Pacino's I've seen when I was yuonger and never heard of him, was Scarface. The way he perfected talking with the Cuban accent was outstanding. I actually thought he was Cuban! Then I saw the GF anf GF2 and thought, "this guy just completely changed his whole speech and demeanor for this movie compared to that." Thats what makes the great ones the greatest in my book.