Like everything else, this service has it’s advantages and disadvantages.
WordPress.org Service:
Advantages:
Because of the open source nature of WordPress, users can easily access programs and templates that allow them build blogsites in and efficient and affordable manner. It is open and available to everyone regardless of the nature of the blog. It is one of the largest Blogsites available today.
Disadvantages:
Due to the nature of open source software, the material offered in WordPress is constantly being upgraded. The speed at which these upgrades occur does not necessarily coincide with the upgrades and changes that occur with the blog templates offered in WordPress. If the user does not keep abreast of the software upgrades and their compatibility with the template they selected for their blog, functioning error may occur.
WordPress.com Service:
Advantages:
Free, easy to use, pretty intuitive. Setting up a WordPress.com blog does not take much time or effort.
Disadvantages:
WordPress.com is less customizable than WordPress.org.
Here is what Matt Mullenweg has to say about WordPress:
