Hey guys,
I don't usually jump into these conversations bc I am inside the line of SCUBA retail and this business, but I can't resist.....
PADI and NAUI are both regulated in what they teach by an international organization. What you learn in class is the same with just a few minor differences in the presentation and execution. Neither one will prepare you for diving better than the other.
PADI, however, is much larger than NAUI, holding about 70% of the SCUBA market. PADI is sometimes referred to as the "coke" of scuba organizations. This crap about one program being better than the other is just that, crap! You pay a little more for the international big name of PADI (coke) versus a smaller brand NAUI (wal-mart soda). The biggest difference is the instructor. Find a shop you feel comfortable with, that has good prices, and that has a knowledgable staff.
I have worked in dive retail for 5 years. I know the ins and outs and I am not here to bash other shops in the Atlanta area. Therefor I wont start about pricing etc..... However, Please Please PLEASE make sure you know what you are getting before the class. Some shops in the area ask you to sign a form saying you will buy ALL gear from them in exchange for discounted classes. Notice that their stuff is probably more.....
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Thats my two cents, happy diving wherever you choose to go!