We've had this discussion ad nauseam on other addiction threads here. The TL;DR of the literature is that in the short term, most methods have the same "success rate", where success here is defined as successfully achieving abstinence from the problem substance.
Participation in AA or other support groups (eg. SMART/Rational Recovery) is associated with substantially increased rates of continuous abstinence at the 1, 3 and 5 year marks after quitting, although there may be some self-selection bias going on there (participation rates being higher among the more motivated and so on).
Participation in AA or other support groups (eg. SMART/Rational Recovery) is associated with substantially increased rates of continuous abstinence at the 1, 3 and 5 year marks after quitting, although there may be some self-selection bias going on there (participation rates being higher among the more motivated and so on).