If you can consider it fast food, the answer is QUIZNOS!!!!
No better sandwich place in the world. You wouldn't think so, but toasting it makes all the difference in the world. I'm just drooling thinking about it- Classic Italian and Spicy Monteray(sp?) Club (I just eat it, I can't spell it)
Only drawback- its a bit pricey.
They must not have Quiznos everywhere yet, because there are too many people saying Subway. I like Subway a lot, but there really is no comparison.
Of the Big Three, Wendy's is the pick. They have the best fries and best chicken of the three IMO. BK's chicken is very good too. McD's used to have pellets in the chicken,
so I've stayed away from their chicken ever since. At Wendy's its the Spicy chicken sandwich, biggie sized with a Frostie instead of the drink
For pizza its got to be Pizza Hut. Its not really pizza, more like amazing bread, but its sooo good, and soo bad for you.