When it comes down to pizza companies listed here I would say it's Papa Johns, Though I only know of PJ's, PH and Domino's so yeah and Pizza Hut tastes good but having worked there I'm going to have to vote against them since I know how crap their ingredients are. Domino's pizzas are even worse than Pizza Hut!

Personally however my favourite company is not listed here, it's Pizza Express and they're fantastic.