My thoughts:
A: Not very good. Sounds filtered in a weird sort of way.
AA: Sounds pretty good, but a little too muffled. Needs more bite.
AZ: Way, way too bright. Hurts my ears.
B: Pretty good, but guitars are a little too low in volume. Would probably get more votes if the guitars were mixed louder.
BY: Good, but not perfect. It could be smoother and more polished sounding. There's some high frequency sticking out a little too much. Also would be better if guitars were a little bit lower so that the drums and bass had more impact.
C: Also pretty good, but sounds a little too mid heavy. It would probably sound a lot better if the backing track had more bass (which is something almost everyone has agreed on... The bass is not loud enough in the backing track.)
BB: Sounds fairly good, but too loud... covering up the backing track too much. It would be better if the guitars were lower.
I think BY and C sound the best. I don't know which I'll pick as I like and dislike different things about each.