Within the last year I have become addicted to subversion. I am an only developer and I also work on a few of my own projects. With SVN its really easy to manage everything
If SVN addresses all of your needs then I don't see the reason for change. If curiosity is the driver of your quest for a different source control then I would recommend reading about git or other distributed scm solution and try to figure out if it's worth the investment in order to switch (which i doubt it is in your situation).