As someone who probably eats more frozen pizzas that he should...I'd have to give the nod to Jacks. Although Tombstone is made by the same company as Jacks, there's something about Tombstone I don't like as well. Tony's thin crust is good too. I'm not a fan of thick crust pizza, either frozen or fresh.
The premium priced frozen pizzas like Freshettas and DiGourno seem to me like they're mostly crust with a little patch of meat, cheese, and sauce right in the middle. Cut away the crust, and you don't have much real pizza left.
