In my experience, IHOP and Denny's are the restaurants you go to when you're drunk. So you can expect food that will please a drunk person. (AKA: any food ever)

Olive Garden is the restaurant you go to with distant family and in-laws. The food is for people who cum buckets over unlimited breadsticks and chewy faux-Italian food. It's also for people who watch Matlock and believe "fine dining" means "feel as awkward as possible while shoveling food into your mouth."