I like more fast foods than the law allows, and I could name my one or two favorite items from every chain or independent place I've ever known, but it would take a while to compile such a list. Right at the top, though, and mostly out of the past:
The Dolores Drive-In in the 1970s, for their cheeseburgers, Suzy-Qs, and cherry lime rickey. Gotta wonder how many times I had that meal. Royal Castle in the 1960s, for their cheeseburgers, chili, and birch beer. The best White Castle-styled burgers EVER, and other items of excellence that WC never had. The hot dogs and a Julius from Orange Julius stands in the 1970s. Chicago hot dogs and Italian beefs from many many many mom-and-pop jernts around Chicagoland. (That's out of the past only for me, it's all going strong there.)
The list goes on. And on.