I'm a Denny's fan but it's been 20 years since I lived close enough to one to enjoy regularly. I prefer Waffle House to Denny's for breakfast, but Denny's any other time of the day.
The Huddle House southern smothered biscuit platter stomps just about everything though. It's an open-faced biscuit topped with sausage or bacon, then hash browns, then sausage gravy, then cheese, then scrambled eggs. Glorious. I tried making it one morning at home and it dirtied every pan in my kitchen but it was the best breakfast I've ever cooked.
(not the one I cooked, obviously)