I knew this would eventually come up. :-)

I'm using Hg because it's something I've used for years and feel more comfortable using.  I haven't been able to find a compelling enough reason to convert my repositories to Git besides the fact that it's snappier and GitHub is popular.  (I might have a bit of a bias because a friend is on the Hg development team, and works for Atlassian.  I also like Python ;-)

I might switch to Git if I have a really, really good reason to (as well as the time to learn it).  But for now, I'm going to stick with using Hg.

-Tommy