My favourite fast food is Wendy's and A&W. Don't get anything from Wendy's too often since it's a bit far, but I find A&W always really good, specifically their Mozza burgers.
A&W is the tastiest, but they are also the priciest around here, their Grandpa-Burger combo is around $10.
I also like the (Sirloin)Uncle Burger & new (Prime Rib) Grandma Burgers.
for desert their Apple turn overs can't be beat.