I've used blogger and didn't really like it.
I've used wordpress hosted on wordpress's servers, and currently have wordpress installed on my own site. I love it. Absolutely love it. I've had no problems with it, I can customize the appearance, widgets, themes, all sorts of things. I find it very flexible and powerful.
I'm a bit of a theme junkie and love being able to install whatever theme I want, try out different things, etc.