Joomla is ok. I've used it but the available tweaks are much more useful for drupal. The biggest content sites are using drupal
I prefer Joomla just because the learning curve to Drupal is soo much harder, templating expecially. Joomla is heavier code wise, but if you have a good server and good caching it isn't a problem.
^Well yeah, just so happens that my server crashes every week. Joomla is really heavy, but it'sok, I tried it too