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Nicholson is my gut answer. De Niro is an excellent actor but I haven't seen the versatility in his work that Nicholson has displayed.
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I have a friend who's convinced that Robert De Niro is just playing himself in every film - he's probably right - so if we're going on acting skills alone, I guess it's got to be Jack Nicholson.
Why do you ask?
Both of these guys are great actors too but I just love De Niro.
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