I've been a Blogspot user for about three years now, but is planning to move to Wordpress because I've been hearing a lot of raves about the blogging platform.
I have two blogs and use both WP and BS.
WP provides wider range of options, very good and easy statistic count and nice interface offering wider range of themes, widgets etc.
You may compare there blogs Forex Ltd Corporate Blog Alex`s Digest
Both WP and Blog spot have their own good points and drawbacks. I'll suggest you to use WP as it is quite professional to use and has more better functions.