I cast my vote for Chicago Deep Dish, even though I have never eaten pizza from the associated establishments. It is just the closest to what I would rate as the best pizza I have ever had, the stuffed pizza at Zachary's Pizza. Originally a Berkeley, California pizza restaurant it is now a Bay Area wide chain.

As far as the two commercial chains listed, I would rather buy a frozen pizza from my local supermarket and bake that at home. At least it would be delivered hot from the oven.