Neither; a regular mousepad wants to grip on the bottom, but slide on the top; these are like mousepad inasmuch as you throw them on the desk, and sit things on them, but they're designed for high-friction on both sides.

When I actually use mine (N800) on the desk, BTW, I lay it flat with the kickstand closed; don't have any trouble with it wandering off. The kickstand is more for functioning as a stereo and what-not.