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.)