Well the only one of those 4 I've flown with is AAC, and they're pretty good - good variety of aircraft (two multis at the moment, a 152 aerobat and they have access to a taildragger, in addition to your usual variety of training singles), instructors aren't too busy generally and are happy to go out of their way to help you, good facilities with a cafe in the same building, not to mention the bar!
. They also periodically run ground courses.