The album covers are priceless:

Dear Penis is the only country song I’ve ever liked.

Oops, there is another....‘Don’t look now mommas got her boobs out’

Brian Regan is great too.

Steven Wright breaks every comedian rule (pausing too long, mumbling incoherently,etc)

Emo Philips (old) Esoteric, cerebral, walking the garden style humor.
James Acaster (new)

;)Eddy Murphy, Richard Pryor, Redd Foxx, Rodney Danger Field, Woody Allen, Steve Martin, Steven Wright, Andrew Dice Clay, Bob Hope, Abbott and Costello, Lewis Black, Lisa Lampanelli, Joan Rivers, Gilbert Gottfried, Jeff Ross. Good mix, I try to laugh at others but they fall flat on the funny scale. The above choices are rib splitters to me..;)

Robin's take on golf. (NSFW).

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Forgot to mention Kathleen Madigan. Really funny.

Bob Hope
Red Skelton

Going old school now.
Milton Berle

He wasn't so funny on 50's TV because of the type of programs produced. But let him free and he was funny.

I certainly agree that Jonathan Winters was truly brilliant, but there was just something about Robin Williams' ability to respond so quickly, and to move from topic to topic in an almost dizzying way.

How about RW being the undisputed best at manic improv commedy?

I'm sorry to say (given his diagnosis) that you are right.

RW=Robin Williams.

(Edit: I did not read dw1's response) Williams was quicker. Winters was sooooo in the same camp. He just didn't do Adderal - lol.

Now, unless I missed it, no one has mentioned Norm MacDonald or Lewis CK.

Or Henny Youngman if going old school.

Quite a list that could be the best at the right place or time.