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WordPress has a lot of options for monetization. Many third-party advertising solutions have available plug-ins that will work with WordPress, and I see options for WordPress probably as often if not more often than options for other platforms.
Plus, with a WordPress blog, if you don't like your webhost, you can move it to another! With Blogger, you're kind of stuck with it.
Eventually you may outgrow that, at which point you can move to something like WordPress (still on your own domain). IMHO, WordPress is better, but not something you hassle with until you know you've proven the concept and know you'll stick with it.
I'm right at the cusp of migrating from Blogger to WordPress. There's nothing about Blogger that really stops you from making money off your blog - I make about $2K/mo off mine. But the "labels" pages are getting too big so long-term I need to get onto a better blogging platform.
I personally think the interface for Wordpress 2.6 is quite nice and the plugins are relatively simple to implement. Anything i've wanted to do, i've been able to accomplish with the plugins and what is already present on wordpress.