Depends on type of food you want. Carl's has a pretty awesome $5 box that's a cookie, fries, drink, double cheese, and a spicy? or just crispy chicken sandwhich.
Mcdonalds signature sammies grew on me though they dropped the fucking sriracha chicken!!. Not good for every day but 1-2 times a week amazing deals via the app most of the time.
Fuck BK unless you are noodle.
Arbys 2-5pm $1 sliders (pizza is best or corned beef) is a great deal, and they usually have some kind of 2 for 5 or 2 for 6. Their fish sandwhich was pretty good I think is current promotion.