I've often viewed the difference betwen NAUI and PADI with the same difference as Chevy and Ford. But I'll also nail one down in personal preference.
When I took my NAUI OW course, I was very satisfied, it was a great expeirence. When I took the NAUI Advanced class, again, satisfied and it was fun. I took the Rescue diver class, again, satisfied and had fun. On to nitrox, again, satisfied, had fun, On to Master Scuba Diver, Once again, Satisfied, had fun, and, GOT WORKED! It was intense! My instructor left no stone unturned. This guy worked us! I got my money's worth for certain. I liked my expeirences with NAUI enough to do the Instructor PREP class. It was intense, It was also fun, and, I was satisfied.
What do I think of NAUI? That's easy, I am in the final few weeks of my ITC for my Instructor cert and it's been a long haul. And still, I've enjoyed it.
When I started diving, I figured I'd do the advanced class, but I remember some words I spoke to many that I NOW EAT. I said I would never be an instructor, I said I'd never dive deeper than 60 feet, I said I'd never dive nitrox, I said I'd never want to go beyond advanced diver. As the years went by, I've digested well each of those statements. NAUI's been good to me, they've made thier classes very accessable to me, and the NAUI instructors I've met throughout this experience thus far, first rate.
I've never needed a reason to look into PADI or anyother agency. I've been out with some PADI Divers, I never had a problem with them as buddies. I don't have anything bad to say about PADI, and if you're enjoying your class, and you feel you're being taught to your satisfaction, you're getting your money's worth. If not, look elsewhere for instruction, write PADI about your concerns with the class you were in, include your Instructor's name and his/her instructor number and these issues will be addressed. As far as an agency change? Do what you want to do. It's your education, but insist on your money's worth all the same.
And.. MOST IMPORTANTLY...
Have fun...
-Dennis