Boy this is a tough one. They are all so good! My favorite is Jerry Lewis, I have bought several of his movies, Who's Minding the Store, and The Nutty Professor. They are absolutely the best.
Lewis plays Norman a store clerk at Tuttle's Department store, and meets with one catastrophe after another, especially where he demonstrates vaccum cleaners, and sucks a lady's poodle, and her hairpiece and everything else from the store into the sweeper which is so full of air and objects it is floating on the ceiling. His love interest is Jill St. John. Great show.
I also love Don Rickles, Rodney Dangerfield, Jackie Mason, Ben Stein, and the Marx Brothers, especially Harpo, who was always tooting his horn! Great times to Rember!