If the question is whether you should use a sanctioned body verse an unsanctioned one, the answer is of course you should! The tech may make diving easier, but your still undertaking a high risk activity and should learn from people using a system and method that is based on the science and experience of good, safe divers. As for which one, that really is a matter of the people in the shops you patronize. Go with the people who make you feel comfortable. Oh, and the issue of sanctioning doesn't change as you progress, if anything it's probably more important as progression usually involves more technical diving and greater risk.