Though I’m sure a lot of them are just variations on leanness and package size. Point is, unless you’re going to a specialty place, any restaurant is going to be buying Sysco patties (or at best, Sysco ground beef packs and hand-formed into patties) but the nicer restaurants are going to be using the better choices, and the shitty places are going to be using the cheapest ground beef formed into a cylinder and frozen.