There's a bunch of chains that started regionally and have grown while still embodying or paying homage to those roots
Ranked from best to worst these are
Midwest: Culver's
South: Chick-fil-A
East Coast: 5 Guys
Pacific West: In N Out
Texas: Whataburger
That's including value. My guess is the most controversial aspect here is Culver's above CFA and 5 guys above in n out. But anything is better than whataburger