Jack Nicholson
Pros:For decades he has been at the top of his game. Has been nominated for 12 Academy Awards winning 3 of them. Respected by all actors, he has become a hollywood icon. The best at blending comedy and drama. Great facial expressions, much like Jim Carry but less over-the-top.
Cons:Might be one of a hand full of actors who is more of a character in real life than on film. You can make an argument that he is really just playing himself. Also most of his characters seem to be the same. His range seems to have gotten limited as the years went on.

Kevin Spacey
Pros:Very versatile actor. Won an Oscar for best actor as well as supporting actor. Brings a sense of intelligence into his roles.
ConsA bit of a streaky actor. He is either great or you don’t even notice him. Seems to only shine if his character has…issues. After winning an Oscar for American Beauty he seems to have fallen off the radar. Needs to make another film where everyone will remember him for.
My Verdict
Gotta go with Jack Nicholson. Kevin Spacey is a great actor. But he needs to do a few more films where he is responsible for carrying the film. In American Beauty, it was a collaborated effort with strong supporting characters that allowed Kevin Spacey to shine. Jack can carry a film on his own. He has proved this time after time. This one I feel is a no contest. But my vote does that matter. What do you think? To vote just leave a comment, your vote WILL matter.