Richard Pryor is my all time number one he got classic standup and did lots of great movies. I think he made even more movies than murphy.
Eddie is second, also classic standup, did many classic movies as well.
He also made Snl his show for seasons he was there.
Chappelle, classic standups, classic show, and he didn't do too many film roles but half baked was decent.
Chris Rock, classic standups, he was on snl but was overshadowed by most the cast,(sandler, farley spade, etc) did movies but wasn't funny in any of them. Had a good sitcom about his childhood, but wasn't actually in that show.
Plus when you take into account he doesn't do standup all that often either you literally only have like 6 shows worth of material for Chris Rock when you think about it. That's not enough material.