Every state seems to be different. In NJ, they seem to all be the motorized kind with the huge spinning brushes inside. Never liked those. The way they pound on your car, they can't be good. In PA, I've actually seen my favorite kind - completely touchless. You pull in, a machine swings around your car, applies soap, etc. and a high pressure wash. Then air dry and you pull out. Wasn't *perfect* but at least nothing touched/scratched my car.
Here in NY, most car washes are comprised of a bunch of Mexicans washing cars by hand.