I have never used either of them. So my vote is not to vote. However if someone could post a link to some information on both i would like to review and give my feedback.
I have used both, however i find drupal much easier to customize. And much lighter on the servers. [your hosts will thank you for choosing drupal over joomla!]
However for large sites/ complex sites Joomla is a little better. And it is also more user freindly.
Well I'm new on the php developing and cms (Since I understand more jsp and servlets), but I'm using drupal, to start, since it seems that it is more configurable than joomla...