i have never gone to any kind of schooling. My uncle has been a body man for 30 years so i just learn in his garage and have worked at dealerships as his assisstant. You dont need any experience really if you go to a school. They will teach you regardless. Will it help, sure it may help, but they will teach you a certain way and with up to date equipment etc.
Either of those schools are good to go to. And each have there perks. Just research both schools to see what they may offer that better suits your interests.