I reheat the pizza, although I prefer not to eat left over pizza. I prefer fresh pizza, because fresh always tastes so much better than the reheated product!
I reheat my pizza, like a sane and rational human being. Those who eat cold pizza should be locked away, for their own good. They are clearly unstable and a danger to society. Ducks are cool though.
I prefer heated up pizza, since cold pizza tends to be sort of stiff and lifeless, but that texture isn't necessarily gross, just ideal, so I can deal with either.