Only that I've had an xbox for 4 years or so, and am perfectly happy with it. I like the direction they're taking with their converged devices (Xbox/WP8/Table/PC), but I know some people don't. As for which is better, at the end of the day they'll be on about a par with each other. They'll both have their niggles, and they'll both excel in different ways. I wouldn't push either one on someone, it's a personal preference thing, but for me, Xbox is the way to go.
I get that, but is there something inherent with the Xbox / MS that means you'll choose them over the PS4 by default?