I'm voting computer science, but really only because that was my primary, and I know nothing about business.
CS is very broad and there is a lot of demand for it. On the other side, people know this, so there are a lot of people going into it as well, as far as I know. I'm not terribly familiar with the job market since I have been settled and not looking for over four years now, and I really only looked at the web development side of things (of which there is plenty).
Good luck, whichever way you go!