My go-to fast-food chain is Tim Hortons. In cooler weather, I especially like their soup & sandwich combos. I like most of their sandwiches, but the (chunky) chicken salad is my favorite. Another plus is that the coffee is ALWAYS good!
For hamburgers, I'll hit BK, McDonald's or Wendy's if I'm in a hurry, but my favorite is DQ (Dairy Queen). I've been eating them for 50 years and they're still #1 with me.
Five Guys is OK, but both their hamburgers and the fries are too greasy for my taste.
Pizza? If you're not sharing, have you tried Sbarro? They sell it by the slice and the serving sizes are very generous. If I'm buying a whole pizza, I like Marco's and Papa John's. Donatos is OK, too, but they're usually a bit on the greasy side. We end quite a few of our TSD rally events at Donatos because most of them have free meeting rooms.
SL