We work almost exclusively in WordPress. We've found this is the easiest Content Management System to learn, which means you can independently make your own content changes and updates to your site, when you need them. WordPress is free and open-source, and many of the plugins and extras are free too. And, quite frankly, we have yet to come across anything that Joomla or Drupal can do that WordPress can't. Combine that with WordPress's ease of use and low learning curve, and you have a winner in our books.