I've never used Wordpress.
Blogger all the way.
Edit: I find this particularly amusing considering that, at least by today's standards, I was one of the earliest bloggers. (2002 isn't as early as the guys who started in the late 1990s, but political blogging didn't really hit it's stride until 2001, and progressive/liberal blogging until 2002.)
Goes to show how times change.
(Not that there is any shortage of "Demosthenes" pseudonyms out there. I just believe that I was the first blogger to use the name.)