The New York versus Chicago debate usually gets reduced to “thin versus deep,” which misses most of what actually separates the two traditions: dough hydration, bake time, sauce placement and even the tools used to eat the finished slice.
Crust and bake
A New York slice is stretched thin by hand and baked for roughly six to eight minutes in a deck oven around 550°F, producing a foldable, slightly floppy centre with a crisp outer rim. Chicago deep dish is pressed into a steel pan with tall sides and baked for 30 to 45 minutes, giving the crust more of a fried, biscuit-like texture from the butter in the dough.
Sauce order and cheese placement
In a traditional Chicago deep dish, the mozzarella goes down first against the crust, followed by toppings, with the chunky tomato sauce spooned on top last. This order stops the crust from turning soggy during the long bake. New York pizza follows the more familiar sauce-then-cheese layering, since its short bake time doesn't require the same protection.
How each is eaten
A New York slice is folded lengthwise to concentrate the toppings and keep grease from dripping off the tip — a habit that dates back to slice counters serving factory workers on tight lunch breaks. Chicago deep dish, being several inches tall and structurally closer to a pie than a slice, is almost always eaten with a knife and fork.
Neither style is a smaller or bigger version of the other — they're built around two different bake times and two different eating occasions.
Which to order for which occasion
New York-style suits a fast solo meal or a slice eaten standing up. Chicago deep dish suits a sit-down dinner with time to wait for the bake and share one pie among several people, since a single deep-dish pie is unusually filling.