The problem I have is that almost all of the comedians have gone through different phases, but all eventually wind up as cynical old bastages.
George Carlin was hilarious up until his last couple years. The cynicism was distracting.
As was Gallagher.
Robin Williams.. his early improv was scary funny..
Even Bill Cosby, one of my all time favorites, has shown some bitterness in his latest years. ( though he speaks good stuff.. just not comedy )
Most of the folks mentioned here have had some great moments, certainly.
Another one I haven't seen mentioned yet: Bob Newhart, and that whole Carol Burnette troupe.
Of course, the Monty Python group
Spike Jones..
The list could go on. Can't say I have a favorite.