Before I start- let me say that I am an SSI instructor, so keep in mind that this system is the one I know best.
First of all you have to ask yourself a few questions:
Why are you going to become an instructor, is the first.
-If the answer is "becouse I want to instruct new divers, and make a living of it" Than I must first tell you you won't make a lot of money of it. Than I will tell you, that probobly, the best oportunities for you will be with PADI.
-If the answer is "Becouse I want to be a better diver, broaden my horizons and maibe teach a few friends/family members how to dive" I'd say everything but PADI, Becouse PADI's system dosent allow of to much "horizon broadening".
Let me give you the pros/cons of PADI and SSI (cant say much about NAUI) in my opinion:
SSI- PROs- The system is very flexible. you are commited to minimal standards (that are a bit stiffer than PADI's) but encouraged to make your own more stricked standards, If you feel it nessesary. I also belive, that the continual courses of SSI are better (to be advanced, for example you need 24 dives, not 12) becouse of higher standards. SSI also encourages instructors to know more for themselves, and teach more, if they think it is good (sometimes teaching more may not be good, beciyse of "overloading"). SSI also has a system of inspection that keeps instructors to the minimal standards, and advises new instructors.
CONs-One MAJOR con is that you must work through an SSI store, and cant work for anyone else (working independantly is possible, actualy, as long as you are affiliated with a an SSI dealer). You must remeber that SSI is an organization of OWNERS, not of INSTRUCTORS. Though I used to be angry with that, I grew to acknowledge the benefits of this system.
PADI's pros-Like said, the biggest organisation, with the biggest employment options. Also becoming an instructor with PADI is easier than with any other agency, as the standards are lower. PADI also belives that to be an instructor dosent mean you need minimal intelegance. It gives you everything chewed up and ready to swallow, just read it, they even tell you how long it should take you, so If you'r not to bright, PADI may be the place for you.
CONs-The last 2 pros, in my opinion are actualy cons, but that's for you to judge. Another thing is that if you DO want to add things in courses PADI restricts you. They say you are allowed to do it, but if you read the little letters, you discover that if anything happens and you dosomething not like the book says, in PADI the insurance wont cover you, and probobly, the organization wont back you up. SSI stand for their own. I also belive that the independant instruction method is not good, since instructors have a kind of freedom that may become "evil". I know of people that made a 2.5 crash diving course and became certified. I led few of these on guided dives, and the way they looked matched the kind of course they had.
I dont know much about NAUI, like I said, but I belive it is somewhere in between- freedom both in employment and in choosing you ways, but you'll have to dig more for that.
Hope I helped you
