It used to be McDonald's because it's closest to me but I haven't been there in months. Don't miss it much, though. That's not to say if you put a cheeseburger and fries in front of me that I wouldn't eat it or be tempted to, but I'm not dying for it.
Once in a while I would really want their pancakes but that, too, hasn't occupied my mind for a while. I like Wendy's, too, but that was always like maybe a once or twice a year thing. I enjoy Subway as well, did have one of their 6" subs a couple of weeks ago.