I both use blogger and wordpress, but I am currently using blogger because I am not that familiar coding with wp
I like the fact that bloggers incredibly easy to use considering I'm a newbie. I have just started to use WP and having a tough time arranging things in it. It requires alot of manipulation in its code just to get some things done. I'm just doing it because I hear people regret using blogger if their goal is to make some money. Hopefully I can get used to it.
Personally I go for wordpress, just the sheer ease of it, the amount of plugins, and themes for it just overwhelms anything else.
Official Blah: WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time.
I much prefer Wordpress, but I host it myself - I haven't tried setting up a freebie blog on wordpress.com yet. If you're hosting your own I definitely think that Wordpress is better - cleaner, much nicer and more flexible when you need to customise it.
If you're hosting on ur own I recommend WordPress. I made the mistake of starting my blog on Blogger, I can't switch now, as it will hurt SERPS.