You can't track both TMEA and ATSSB. If you ask me (and I have tried out on both). You will have a more enjoyable experience if you tryout for TMEA. ATSSB is, and lets face it, mediocre and is a baby downed version of real All-State. Plus, the real reason behind all-region/area/state auditions is to become a better player and ATSSB doesn't help (me at least) at becoming a better player.
Just my $0.02