Every now and then, I order from Pizza Hut when they have large pizza deals for about £10, and have it as my main meal for two days.
In practice, my main meal the following day is breakfast. I don't bother heating it up. Heck, by the time I get to eat it the previous evening, it is usually cold anyway. It's still nice, though.
I've never tried Dominos. They cost a lot in the UK and their deals are pathetic, I think. I might not be alone in my opinion: