Why must some people (especially the n00bs) perpetuate this myth? As mentioned above, most still frequent both sites. Both have their merits depending on what you're looking for. I don't post here as much as I used to, but I still come here most days to read AO/PO.
But whatever, do what you like. I will say though, if you come trolling at AN you're going to need that laxative to get your caps lock key out of your ass.