Both.
Touche - De Niro's performance as a young Vito was spot on... however, for me, there are very little performances that can match and/or surpass the raw power of Ledger's Joker. He is such a visual tour de force, such a force of nature, that you cannot take your eyes off of him everytime he's on the screen. I can understand that Ledger's performance , and maybe the actual character of the Joker didn't resonate as strongly with some as it did with others, but for me, personally, it is one of the finest performances of this decade.b. (more a comment than a question) don't forget deniro's performance as vito in part 2. that was something spectacular. i know it says "the godfather" but i believe that characters that are in more than one film are being considered for all of it, yes?