My answer to this question has changed since the new Wave3 was announced.
Before, I would have said that PSAs would give you more lasting value, as long as they were active.
With the new Wave3, your PRM does not have to purchase anything in order to be of value to you. If he or she tells all his or her friends, and if any of them join and purchase from TripleClicks, you win.
So, I would say, recruit both.
