A move to the AAC assumes things work the way they’ve always worked. Teams with upward mobility ambition work their way up to bigger name conferences until they get where they want to be.
That era is basically over with the most recent set of moves. Staying in Sun Belt is the way to go. The remaining G5 teams are just going to continuously shuffle around, and Sun Belt is in the strongest posture for the next 5-10 years.
That said, if attendance is the end all be all, then the AAC makes more sense because those names (and a new conference) will excite the casual fan base.