January 6, 2009
Couldn't pick just one!
Varies, but Willow most frequently.
If pressed I'd pick Buffy, my first love, as my overall favorite. Firefly is my second choice and gets my vote for the highest quality per episode. But really I love them all -- Buffy, Angel, Firefly, Dollhouse, and of course Dr. Horrible.
I've been a hopeless Whedon addict since 2001 (better late than never). When I joined MeetUp, Whedon-related groups were the first thing I looked for.