Drupal or Joomla?
I hear this question asked all the time. Both are great content management systems, both have pros and cons.
Drupal has the advantage of being able to function as a programmable framework while Joomla has its huge array of commercial and free extensions in its favour.
However what will settle this argument, I believe, will be the ease with which users can engage with the CMS. Joomla has the edge currently.
Usability is what will drive technology in this decade.