I switched from Wordpress to Drupal, and my opinion is that, for a site that is strictly a blog with perhaps a few static pages, go with Wordpress. It's optimized for blogging, and handles pretty much everything you might want to do with a blog right out of the box.

If you want more than that, go with Drupal. It will do much more, but the default installation is much less convenient for blogging than Wordpress. To really get the most out of Drupal, you have to go find (or write) modules to do what you want.

I think both are excellent options for website building, but targeted at different types of sites.