i prefer joomla.
furthermore, i prefer drupal. but the learning curve is too much for the students who will take over after I leave (I dedicate way too much time for the computer!!!).
joomla can be learned quickly enough. there are many tutorials. And with wordpress, comments can be a hacker target, as well as other places. Always look up security precautions!
ps. check out
http://gwestrobotics.com/2009 . joomla powered!