I used to absolutely hate fastfood, but now I can usually find something I will eat off of the menu at most places. I have the hardest time with McDonald's though, as most of their food really messes with my stomach. I can't really handle much deep fried or greasy food. I have always loved Subway the best though, and my mom says it is likely because it was a craving of hers when she was pregnant with me. Her other one was Taco Bell chips and cheese, which I also love. Subway doesn't hurt my stomach and I love the variety and how I can customize the sandwich however I want. Their new vinegarette is very good as well.
I try to avoid fast food as much as I can. The times I do eat it tend to be when it's 2AM and I need something to eat for the all nighter of studying ahead of me. Wendy's is open till 4AM near me, so I can just go there.
However, if I did have a choice of fast food, I'd probably go chick fil a. Their stuff seems a lot higher quality than something like McDonalds.
... but if chipotle counts as fast food, I'd probably go for that first.
There's this Chinese fast food in my city where the cooks are Chinese from China (you can hear that by their accents) and it is labeled as fast food only because they make the food in morning and warm it in the microwave when you order. 😄 I rarely eat fast food, but when times are tough, that is my go-to place.