Both are good programs - you probably know AAA will be a time commitment. You do not say how old your daughter is so tough to answer in more detail -here are some observations
CYA have been very successful at younger levels - really good 96 and 97 players and younger too. Mission has been better at the older level.
Mission won state championship at 19 level, CYA won at 12, 14 and 16 levels.
Year befoe CYA won 12, 14 - Mission won the other two
So - CYA might be doing better at younger levels - 1996 and younger.
Coaching pretty good at both programs - some parents at CYA have some issues with the u14 coach - the comments appear to the widespead so you find some of the parents and find out the real story. Mission 16 and 19 coaches are well liked.
Good luck - will be interesting to see what shows up here. Also, as you know the teams are forming now - informally and then formally with tryouts which should be scheduled soon. You probably need to be well along with your process particularly if your daughter is 16 or 19.
Early word is that CYA will be really strong at 16 - Mission really strong at 19.