Buying a console at launch has never seemed worth it for me, mostly seems like a bragging rights contest whenever one of my friends does. Besides, we know NOTHING about the next Microsoft console, so the question being between the two is a bit silly, because there is only one informed choice here at all and we still don't have all the info on the PS4 either. I'll wait about six months to hear what problems they have and maybe decide then, that said, I've moved toward mostly PC gaming now anyways.
So far, the only console I want at the moment would be a Wii U, once it has a few more titles out.