Zen or KPO

[wegs the wegs]

I have Ultimate Points to blow and figured a free book wouldn't hurt. At the moment I have extra for one of the books, Zen and the Art of Poker or Killer Poker Online.

I here that Zen is pretty good at helping with psychology. The reviews that I have read about KPO is a mix of pros and cons. I'm considering it because I hear that it teaches the aspects of roll management and other busy work quite well.

Opinions?