Pizza napolitana is baked like normal pizza except generally without the cheese. Fresh mozzarella is added to the pie only after it's fully baked since a lot of the flavor of the cheese is lost in the baking process. NY style pizza generally uses multiple different types of cheese with a base of mozzarella, provolone, and sometimes even cheddar and often thin crust baked in wood fired brick oven which gives it a nice "char" on the crust. NY style often uses "old world" pepperoni too which is categorized as having a more "bold" or spicy flavor compared to normal peperoni because it does not use a casing that makes it lay flat. Old world pepperoni is usually identified by it's "cup" shape.
Chicago style is generally baked in a pan and the cheese is on the bottom with the sauce on the top.
(not AI, I just really like pizza)