Jeremy Lott says libertarians are more fun, which I agree with. I have a few reasons to add. First, they don't tell me what to do. Second, they think things like alcohol, drugs and sex can be fun (not to mention potluck picnics). Third, they at least pay lip service to using science, including economics, and tools like analysis and reason to overcome bias and wishful thinking, so they tend to be a little lest frustrating to argue with.

The main thing I'd like to see changed in libertarians is more compassion. The pro-personal-independence stance of many libertarians seems to encourage them to overlook suffering. I guess that reveals my preferences to be as much socialist (that is, I support taxes & many social programs) as libertarian (I support individual liberties).