I went through IANTD's tech courses up to Full Trimix. I didn't choose IANTD, it chose me when the instructor moved to town. The instructor said that the best thing I ever did to prepare for technical diving is take GUE's DIR Fundamentals. After some long conversations, he understood my commitment to the DIR principals and reconfigured his own gear and the training methods to accommodate my desire as best he could. He now applies many of those principals into his own diving. I was amazingly surprised at how willing he was to entertain and embrace the principals of a different agency and adapt it into his teaching, and now to his own diving.
I think Fundies as a basic is best.
I think Fundies as a basic is best.