Am I delusional, I find them fairly similiar tasting.
Shake shack cheeseburger vs. wendy's classic double with cheese.
Both the beef patties are kind of loose so its juicy. When you the put the cheese on top, they taste fairly similiar. Althouhg I didn;t eat them side by side, I had em a day apart. The shake shack one was a little greasier i think. Both are excellent burgers. Maybe I got lucky at wendy's.