In reply to Ken Summerville.

@Ken Depends on what specifically is "best" and against what other platforms.

For example, I can claim that WordPress is a better solution for blogs because WP is a blogging platform. Using Joomla or Drupal for a blog is not ideal as these are full content management systems for more complex websites.

Every CMS has pro's and con's and not every CMS is right for all websites; depends on what the site is and needs. If you are basing it soley on usage, then the statement should read "clearly the most popular" and not "clearly the best" platform.