Hmm, I don't eat burgers that often, especially fast food burgers, but when I do, I prefer McDonald's. Overall, better burers and fries. Mucho cheaper on my wallet as well.
BK, here they are very clean, the hamburgers are huge and tasty.
MCDonald's has a lot of little kid from the street entering to eat the rests of the food.
mc donalds is cheaper but BK is just plain better tasting. if burger king was like 2 dollars more expensive on everything on their menu, i would vote micky d's