MK: Pecos Bills & Cosmic Ray's have - lettuce, tomato, raw onions, pickles, relish, mushrooms, sauteed onions, cheese sauce, ketchup, mustard, mayo, barbecue sauce.
Epcot: Liberty Inn & Electric Umbrella - a little more basic - lettuce, tomato, raw onions, pickles, relish, ketchup, mustard, mayo, barbecue sauce.
MGM: Backlot Express - same as in Epcot. They haven't had the Cheese sauce the past few years unless they brought it back this year.
I Like Pecos Bill's the best.