All time favorite is a Colorado only place called Good Times, best damn burgers and fries I have ever had. Around here we only have the big three, Wendy's, McDonald's and Burger King, of those I'll go with Wendy's.
I don't have a particular favorite. The fast food industry is really not good for your health. Too much salt in the burgers, deep frying; a/k/a grease in fast food chichen chains like KFC, or MSG in chinese places, just don't meet my healthy needs. It is usually a last minute stop, during a trip or something, and only if I am really really hungry, would I find it necessary to make a visit to such places. Then it is the smallest or cheepest item on the menu, if I dare to choose!
What is your favorite fast food place? McDonald's, Burger King, Wendy's, Subway, Quizno's, Taco Bell, etc... I think I would have to say Subway...
Definitely Taco Bell. Something about the combined nostalgia appeal from eating it a whole lot while my mum was in school years ago, and the fact that I just genuinely enjoy the taste of my regular orders is pretty much the only reason I ever get fast food.
Okay, well, that and Burgerville milkshakes. But Burgerville's a small chain, not a really big one.