I think DeNiro has more depth than Nicholson, he’s certainly typecast, but he does break from it sometimes.
Compare “Carnal Knowledge” to “As Good As It Gets” and you will see the same self-centered misogynist with a 25 year age difference. You could slide “Terms of Endearment” in the middle and you still have the same guy.
Well, you've got a point there. He is typecast, it's just a rather unusual type. He would have made a good Charles Manson.