Probably little to none for most pizzas since they’re so thin, but with something like a deep dish you might end up with cooked cheese/toppings and doughy crust, or cooked crust and burnt cheese/toppings, or vice versa if the heating element is on the bottom.
I notice zero difference between preheated pizza and non-preheated pizza. What would the difference even be?
Probably little to none for most pizzas since they’re so thin, but with something like a deep dish you might end up with cooked cheese/toppings and doughy crust, or cooked crust and burnt cheese/toppings, or vice versa if the heating element is on the bottom.