Years Diving/years certified doesn't necessarily mean too much though. Many divers get certified early in life, take many years off and come back to it later. Also many divers who are less avid - or more logistically and/or geographically challenged - may have been certified for many years, but are not such regular divers.
IMO there is nothing to suggest that just because you have been certified longer, you know more or have more experience. Although by this token I suppose you could say the same about dive numbers, although at least with that you would assume the more experience a diver gets the more skilled and knowledgeable they become. Or not, assumption being the mother of all f£*k ups and all that!