I cannot answer this, but the AA and other 12-step fellowships I see described here often seem to have little connection to what I have seen in dozens of meetings over 7 or 8 years in Delray Beach, Ft. Lauderdale and Miami, Florida.
I suspect there are huge regional variations. Even down to reading that some meetings serve sandwiches and run over an hour. Some meetings provide new members with phone lists with numbers (if I understand that correctly). Some meetings are welcoming of the newcomer. Others are much colder until the newcomer has proven a commitment. Some meetings have over a hundred people others regularly have less than 10 in attendance. In some meetings the chair comments on each share, in others the chair does not.
And those are just the superficial differences.
I do not think it is possible to say what is the "best," because the "best" will be different for different persons with different needs and tastes. But it would be interesting to hear more about what the regional variations are.