Great Food Debate: A Clash of Pizzas

Hear ye, hear ye, audience of great tastes. Now is the time for strife— an eternal conflict; the unanswered question...

Pizza toppings. Items for this weeks debate:

1. What's the ultimate pizza combination? (Pepperoni & sausage, pineapple & onion?)

2. What is the best single topping? (Extra cheese? Ham? Anchovies?)

[EDIT: for clarity, what I mean is: What is the topping that "makes" the pizza for you. It doesn't have to be "alone" on the 'za, but what defines it— gives it character. But interpret it either way, I'm not gonna limit your creativity here.]

MAKE YOUR CLAIMS. I expect massive death from this. Massive, massive death.