I chose QFF when faced with your decision. Really it is only BAEC and QFF that are good at this game, and for me QFF is considerably better than BAEC (but you have to do your own earn/burn calculations). Emerald on the other plans is generally harder to earn; for example on MA it is by invitation only. But each plan has something good about it (IB for example gets you free parking and car washes at MAD). Just remember that most are enforcing the 4 segments per year requirement for status.