I use wordpress for a couple of different blogs I'm running, and I used to have a blog on blogger. Personally, I prefer wordpress, but I'm also one of those people that go in there and play with they way it looks.
The interface has changed recently with the new version. It's a lot easier to add widgets and to personalize and the number of themes are amazing. I will usually take a theme and then tweak it with my own graphics and things.
I'm using a pure theme on
my personal blog (I haven't changed it yet) and I adapted on the
crime watch blog I setup.
I think its the personalization you can do with wordpress that I like. And, IMO, if you are going to be purchasing a URL, it would be a bit more professional then blogger, I think.