Wow. Just did a search, and apparently there are no polls like this already. There were so many great roles that it was impossible to fit them all in one poll, so I divided them into two. This one covers his more recent years.
Cape Fear, by far.
Goodfellas, although it was hard to choose between this and Cape Fear.
Oof, I guess Cape Fear would be a good pick, but… I really do love Midnight Run, and he balances comedy and emotional burden so well in the film. Ah, hell – it gets my vote.