don't worry about the Mesa program. In fact, last time I heard, Mesa was going out of business but don't quote me on that. I might be mistaking it with another airline. Either way, just because its a bridge program does not obligate you to work for Mesa once you graduate, you get your ratings just like every other pilot. Airlines don't really care where you got your ratings, it might give you and edge, but it won't disqualify you in any way.
ASU is a party school, completely opposite of what you will get at ERAU, let alone at the Arizona campus. ERAU is small, quite and completely lacking of girls and therefor, any sort of partying would be at a minimum. ASU has allot of girls meaning allot of noise and alcohol. It all depends on what you wan't out of a college experience.
With your academic record, why don't you consider majoring in something that is not aviation? you can just minor in aviation. That way, you receive all of your ratings but also receive a degree that is not totally useless outside of the aviation industry. Just a thought.