In general, probably Match Game. But I'll always remember him from "The Dean Martin Show" with Marty Feldman doing the "Gimme 5 Bob" skit. Hill-arry-ous!
(The problem with compromise is: the first person to "be reasonable" loses the biggest chunk!)

He'll always be memorable to me in "Lidsville" and those "Love, American Style" skits from the 1970's, besides "Match Game" and "The Ghost and Mrs. Muir".

I'll always remember him for playing Claymore Gregg on the Ghost and Mrs. Muir. But I also have a recording of him singing in the Broadway version of Hello, Dolly. His song at the end "It only Takes a Moment" is fantastic. He was replaced in the movie by a lesser known, much less experienced at the time, Michael Crawford.

He is probably best known for Match Game but should be better known for his Broadway success as both an actor and director. But TV does that.