Having had a look at both Blogger and WordPress I like both of them, maybe for different reasons. Blogger is very easy to set up initially and gives you plenty of scope to play about with how the page looks especially colours.
WordPress on the other hand does have a lot of templates you can use, and I think of the two offers the better widgets, but I can’t say that I’ve tried all of the them out on both services yet.
What they both need is a creating writing robot so I can get on with the fun stuff of playing around with the widgets and code.
Here is another opinion
and a very useful feature comparison Pulsed: Blogger vs. WordPress.com Comparison Chart – 2009.