These polls are utterly stupid, Drupal is not a blogging system yes it has that option but it is not built for a blog. Wordpress is, you cannot compare the two!
Drupal is a much more robust CMS, but it's got a much higher learning curve. Wordpress is pretty much plug-and-play. You install it and everything is pretty much set up for you. Most single-person blogs are going to prefer WP over Drupal just because it's much easier to use and has more features than Blogger (which is more of a blogging platform for people who need their hand held through the whole process because they're not very experienced with web development). I use Wordpress, although I do stay active with my old Blogger account. I'm not ready to dip my toes into Drupal yet.
I've heard awful stories from webmasters trying to learn Drupal. Many said ExpressionEngine as a CMS was the best, whereas WordPress as a Blogging system is the best. Joomla is very easy to use and highly customizable, but not as easy as WordPress or EE. I have tried ExpressionEngine Core and Joomla, but it was too time consuming. No time to learn. So, I'd vote for WordPress, it is too easy. I am just scared to death at the thought of using Drupal, because even experienced Webmasters were unappy with its complexity.