Isn't Pizza Hut more greasy because they spray butter on it after baking?
At least when I lived out in Canada that was what they used to do when we picked them up from the supermarket concession.
I don't get takeaway Pizza very often but I think from the big chains you are going to get a nice tasting pizza either way. There is no point trying to argue that one is healthier though, as at the end of the day we are talking about a huge load of processed carbs, cheese, along with sauces and ingredients which have excess amounts of salt in them.