Jim,
i always remembered Hollywood Squares as featuring a lot of celebrities whose acting careers were mostly over. It seemed like Paul Lynde was the most popular, but I'm not sure if it was because of his quips, or because he was always the center square.
Match Game, though on a smaller scale, featured various celebrities (and a few regulars) whose careers, for the most part, were still very much active; and at the end of the show. Gene Rayburn often asked them about the projects they were working on.
https://youtu.be/ESgVZ75npzc
Jim