How many dives under OW would everyone suggest before moving to AOW?
This will raise a HUGE debate, as has happened frequently. This is one of the most divisive questions on Scuba Board.
Many will agree with me that the big problem is the "A" part of AOW. People get the sense that someone taking the class should be an advanced diver. The intent of most agencies, though, is more of an OWII class. In it you get experience doing different kinds of dives. You learn more skills and have more time with the instructor. Those who follow this line of thinking (including myself) don't feel you should need many dives at all. I myself was dissatisfied with my level of training after OW and took AOW without a single intervening dive. In retrospect, it was a good decision. I got 5 dives with professional guidance and benefited greatly. When I got my subsequent experience, I was practicing good technique.
Others argue that you benefit from the experience of doing a lot of dives on your own and will learn more from the AOW when you eventually take it.
I feel that experience is beneficial when it is good experience. If in your experience you are practicing and reinforcing poor technique, than that practice may do more harm than good. In almost all sports, I recommend competent instruction before bad habits develop.