Nice, honest and neutral comparison…
I very much like the way it's presented and agree on more than 90%.
But after experimenting both systems quite extensively, I have to say that theming (or templating) on Drupal's side far superior and remains accessible to even more intermediate designers unlike Joomla's.
URL : http://www.alledia.com/blog/general-cms-issues/joomla-and-drupal-which-one-is-right-for-you/