I haven't actually extensively used either platform outside of stupid little required uni blog assessments (gods, don't even ask), but as far as personal preference goes I think wordpress looks much less chunky and more modern and professional. I've also heard lots of horrible things about blogger, and lots of good things about wordpress, just by general word of mouth so my vote would be on wordpress.

I also found all the behind the scenes stuff more intuitive once I got a handle on how things worked. Blogger is more liable to have me throwing my hands up and wtfing at the world (given that most of said blog assessments required group blogs which my idiot classmates could screw around in and with though, that could be the source of my frustration.)