That assessment that you did was, in my opinion, ridiculously biased. Objective comparisons should first, not be done by an instructor with any agency, and second, not include false information. You present the information in a somewhat unclear format making it hard for a true comparison.
My biggest problem was with your comments about the rigidity of the PADI system. The PADI System is very flexible, you just may incur some extra liability if you step outside of what is outlined. This is true of all agencies. PADI does not force divers to do everything in one course, but it does allow it's instructors to add pertinant local information. We have continuing education for things like decompression theory and physiology that is beyond the scope of an openwater certification. Does an open water diver really have to know the three different types of Embolisms? They can learn that in Rescue and Divemaster, if they want.
I work for an instructor who can teach both YMCA and PADI, and his opinion is far different from yours. He says the YMCA course takes at least twice as long to teach, so I am interested in where you got your numbers for classroom time. He does not teach it purely because it is not practical for most people who want to learn how to dive. We encourage weekend classes, making the 31 classroom hours, even including pool time, a very off base figure. I would say that the total time it takes to be completely certified is less than that (including classroom, pool, and open water dives).
I don't know if you refer your prospective students to this page so that they think you are the scuba god because you teach YMCA or what, but your intentions do not benefit the dive industry. I am not saying that PADI is better than NASE, NAUI, SSI, YMCA, Handicap SCUBA, or anybody else, I just don't think you should make unfair comparisons.
It does boil down to the Instructor over all other variables, but certifying agency is important. PADI protects its divers by testing air at all PADI dive centers and implementing a very strict quality assurance program. Nearly every student will get a survey, and if they mark any questionable responses it will be followed up with a detailed survey to identify problems in their instruction. No certification is as recognized and taught worldwide like PADI.