[jome]

I guess I'm biased too, since I work closely with the AIDA system. But from my point of view, which ever you choose, make sure it's a good instructor. It's also good to be aware of the crossover possibility, so don't have to make a choice written in stone. For example you can do a basic level course with PFI, then intermediate in AIDA and Advanced in AA. Or at least from the AIDA point of view.

Personally I like to cherry pick, ie. if time and money allows, participate in as many different organizations classes as possible.

This I can say:
-AIDA has come a long long way in the past 3-4 years in terms of education. Our education system is without being too modest pretty good.
-Every time I've been involved with AA (Sharm WC, the apnea conference in Lignano) I've been impressed
-Very impressed with FIT/Martin

Not done a PFI course yet, but hope to cross that out from my list some time as well...

On an individual level - every organization has good and bad instructors.

Which ever organization you choose keep in mind that freediving is an activity that can be "taught" only to a certain extent - most of the work you will have to do your self after the course.