I prefer PPJ over Dominos, simply because I think their pizza crust tastes better, and (usually) their pies aren't as greasy.
But I only go there when I'm rushed for time and find myself near the local store. That said... I can tolerate a thin-crust Dominos pizza, providing there ain't a bunch of greasy meat on it.
If I'm having folks over for the big game, or wanting quality over quantity and price - I'm hitting up my local family-owned Italian buddy's place. His pizza ain't the cheapest, but it is the best.