[gpm]

The moon's stability is a good point, but not conclusive. The moon's orbit isn't perturbed by it's own gravity. It's also much larger, so much more mass (radius cubed)/surface area (radius squared), so less affected by solar wind, micro meteor impacts, and the like.

[pxi]

But still, it's more likely we'd find evidence of a distant past civilisation on the moon than on earth right?