Burger by far, and im part italian! still like pizza tho... the best is a bacon cheeseburger with lettuce, tomato and ketchup. preferibly 8 ounce (half pound, yes they exist!) with real bacon thats cooked crispy, not stringy. HAS TO BE A REAL BURGER. ABSOLUTLEY NO FASTFOOD
It matters who and what makes the burger and pizza. If it was McDonald's making the burger, I'd prefer it over pizza. If it was Blackjack Pizza making the pizza, I'd chose it over a burger. However, if it was Blackjack Pizza against McDonald's burger, I'd chose BlackJack Pizza, because their pizza is awesome.