Cold tomato sauces have their own appeal. Letting the cheese chill also is nice.
If the pizza is still warm from the first time it is cooked, that is the best. But reheating never works right, and cold is much better than that.
Luke warm is okay, but it’s better if it’s aged, and then it’s really not good to eat. (A kid at choir camp would sell his day old pizza–we could only order them at night, and he’d sell them in the morning for $1 a slice. We had no refrigeration. And, no, I didn’t pay a $1. We became friends, so I got it for free–sometimes a day later.)
I’ll eat it cold sometimes (when I’m both hungry and lazy), but the best way to reheat pizza is in a non-stick pan on the stove – put it on med-low heat for a few minutes, and it will be much closer to its original state than soggy, flimsy microwave reheated pizza.
Cold pizza goes great with hot coffee. Personally, I don’t like any food or beverage room temperature. Reheated pizza is okay, and I’ll eat it that way sometimes if it survives until lunch time. But for breakfast, with coffee? Cold pizza all the way.