Another vote for Dinosaurs.
Other than that, the 1990's weren't a good decade for sitcoms.
I Googled top 20 sitcoms of the 1990s and can honestly say I didn't watch any of them. And somehow Dinosaurs didn't make that list, LOL. Of course, my children were born in 1987 and 1991 so I didn't have a lot of time to watch TV in the 1990s.