and how to organize the sleepyhead data for best content: https://sleep.tnet.com/resources/sleepyhead/shorganize
It seems you've done your homework. For complex apnea, I would recommend the ASV and specifically the Resmed Aircurve 10 ASV if possible. Users of that machine seem to have the easiest time getting it to sync with their breathing and making adjustments. It's good your son has someone looking out for his well-being, and I wish you and him the best of luck and health as you make your decision and move forward.