On the left: the box from a thin and crispy pizza. On the right: the box from a deep pan pizza. In this case, you don't need a kilojoule counter to work out which option will be more fattening.
As our takeaway pizza guide points out, you shouldn't eat more than two or three slices of any kind of pizza if you don't want to pork up. That said, choosing a less fatty crust option is also a good idea. And as for those extra-cheese-injected options, only a greedy cardiologist will thank you.