Lenny Bruce is still the most brilliant - and most influential - of all time, in my book, although he's more than just a comedian.
Rodney Dangerfield makes me laugh as soon I see him, the guy just fires off joke after joke, impeccable.
In 1979, I saw Jerry Seinfeld come in SECOND in a young comedians special.....I went to school the next day and did his whole act. I feel like I picked the right horse with him. And, sorry folks, Bill Cosby will always be one of the masters, and another one of the most influential of all time. The first thing I did when he got convicted (which I agree with) was put on "Revenge". Why should I be punished for his crimes?
Although they're not PC (a term I detest, but it applies here), Eddie Murphy's special "Delirious" was the most outrageous, hilarious thing I ever saw, and is still unbelievably funny. And Dave Chappelle's FOUR specials from 2017 are practically dazzling. Four specials in one year, unreal.......Chappelle can make you cry with sorrow about something......and then turn on a dime, and make you cry with laughter. The only other guy I can think of who comes close to that would be Lenny Bruce. (and Charlie Chaplin)
Wanda Sykes, George Carlin.....damn there's so many. Redd Foxx! Mort Sahl is a forgotten comic who was very influential. Woody Allen was a great stand up comic. Carl Reiner and Mel Brooks. Nichols & May. Burns & Allen. There's a lot of comedians from the pre-cursing era that were great that get no props, anymore.
Sarah Silverman's recent bit about squirrels cracks me up.
Not comedians, but Monty Python are big faves, and the early cast of SNL, and SCTV....nothing will ever beat 'em. From the silent era, Fatty Arbuckle (especially when he was with Mabel Normand, who was also very funny), Max Linder, Harold Lloyd and Buster Keaton are my faves. Mary Pickford was also hilarious, though no one thinks of her as a screen comedienne.