I recommend Wordpress. The main reason I went with it was really group think - so many of my favorite blogs use Wordpress. Looking for comparisons online, it didn't appear like either was a clear winner or had some killer feature. I have been using it for my blog and am very happy with it - I find plugins for just about anything I want, or just customize the PHP if needed. I also like that there are two multiple blog projects (Wordpress MU and Lyceum) so that if I ever decide to go that route for a new site, it should be comparable and I can leverage some knowledge I have from my current install - and perhaps plugins, though that is more hit or miss.