I guess everyone seems to say ADs are awashed with Annual Calendars, but i also think it is not that different for Perpetual Calendars. Most ADs have at least have a couple of Perpetual Calendars put in the safe, hoping to move the Annual Calendars first. They do not put them on the 'roadside display window' but definitely you'd be able to find them being displayed in store and they would take it out of their safe in a wiff if you do ask!
Other then that, i think both AC and PC are equally good, and it appeals to different people. AC are good for those who like a complication, and not being fussy about adjusting the watch,a dn PC is also great, as it gives the user great comfort of mind. But heads up, i'd gladly go for the PC as it has that 'watch winder box' so i need not make space on my current winder which is at gull capacity!