Having been to Italy a handful of times, I can tell you that there are many different kinds of pizza offered.
The pizza margherita is specifically Neopolitan, so you would get that if you go to a Naples-style pizzeria. It’s not what you get at a standard Roman pizzeria. The fornos where I would go would have say around 6 to 12 pizzas pre-made. When you ordered, they warmed up a pre-cut square piece for you.
I don’t recall all the different varieties, but there were many kinds of meats, sausages, fish, vegetables, cheese, etc., available.
The one big difference from American pizza, I would say, is that in addition to tomatoes and cheese, you generally get one other topping. Like, just prosciutto, or just mushrooms. I didn’t see anyone ordering a pizza with multiple toppings. Oh, and I think there was often a pre-made quattro formaggi available.
Another very common kind of pizza was just plain pizza crust with a sprinkling of cheese and olive oil. We wouldn’t even consider that pizza in America.