Why are you choosing an agency at all? IMHO there's basically GUE which will require you to go through their curriculm start to finish. You will have a fair bit of confidence this is top shelf.
And everyone else where agency is really just letters on a card but instructor "makes" the course.
We have discussed this so many times here its insane. Agency is nearly worthless.
Most have non-existent quality control and there are loads of crappy instructors out there teaching crappy tech courses.
Sorry for not looking around before posting.. my bad.
Also thanks for the information, I can imagine that with Tech diving, choosing a good instructor is alot more important maybe than recreational scuba..
I will certainly take this on board..
Thanks for your help