Burger.
I just can't imagine a life without burgers. I love pizza, but pizza is a sometimes food. I can ALWAYS go for a burger.
Also agree I'd take bad pizza over bad burgers, as long as I can also have good burgers over good pizza.
Kinda like fries vs tots. Good fries are better than tots IMHO, but bad fries are worse. And tots are so consistent that at the very least you always know what you're going to get.