Hands down: The Carol Burnett Show. With or without the lovely Lyle Waggoner. With or without the exceedingly funny Tim Conway (especially when paired with Mr. Korman.) The skits, the mini-musicals, the fact that she had Kay Cole guest star one week...it was just the bee's knees, in terms of variety shows.....
Ah, the CBS Saturday nights of my youth: All in the Family, MASH, Mary, Bob and Carol.
(Only rivaled by the ABC Friday nights: Bradys, Partridges, Odd Couple, Room 222 and Love, American Style.)