Wordpress is the first used CMS (Content Management System) script, it's a Blog system which all search engines bots prefer, it's popular with a big community to help, lot of free plugins and themes providers, easy to use as you said and easy to manage/Update.
The others are good also, like joomla..etc but in the Blog sphere Wordpress is the best!
When I had a choice to learn a CMS and use it to build my own website and build websites for others I picked WordPress because my clients would be best served by it since they would be able to developers in their own town to work with if they wanted to.
WordPress is far better than any other CMS based blogging platform. It has so many decent features along with countless plugins to support your purpose. It is easy to handle and effective for search engines.