The people who say George Carlin is a goat have to consider how much he changed his style. He was a total hippy goof ball until he had a heart attack and then came back as an angry comic in the 90s. From there he kept becoming more and more political and meaty with his material. All the stuff that you say aged well was during this period. That is around 20 years of pretty amazing stuff. Chappelle has already put out 20 years of material. Chappelle was coming on the scene just as Carlin changed it up.
In my taste, I think Chappelle is better but not by much. Chappelle is a natural storyteller that I don't know if any have surpassed. He does it so naturally. Carlin really worked hard to get good at the end and was very good. I saw both live. Chappelle was just better but I saw Carlin at the end a few months before he died.