Topping-wise... either cheese, double cheese, triple cheese or chicken, double chicken XD You get the idea. I don't like many other toppings, since pepperoni is too spicy, and many of the other meats vegetables don't taste nice on pizzas.
As for crusts... I'll take anything. Stuffed Crust, thin crust, deep pan... I'm not fussy. ^_^
As for chain... either Pizza Hut (I <3 Pizza Hut), and a little takeaway in Newcastle called My Kinda Pizza. Their pizzas are brilliant. :P