There is no doubt that WordPress has won the war of the blogging platforms. Tumblr might be nice and all but if you are going to run a proper blog with the idea of monetizing it, WordPress is likely to be your choice of platform.
Pingdom has reported that 49 of the world’s top 100 blogs are currently running on the WordPress platform. 40 of these are self-hosted. 9 are hosted by WordPress.com.
The second most popular platform is Movable Type with just 7 blogs running on it. Google’s Blogger platform is being used by two of the blogs. Tumblr has just one blog in the top 100. Seven of the top 100 blogs are not using a recognizable platform.