i use drupal and i am still a newbie but the learning curve is not too bad so far the online tutorials are a real help. I would highly suggest it if you want to check out my site that i built using drupal check it out thedoctorsforums.com
drupal is easy to use joomla is hard but its the perfect. if you are just starting then you can go from drupal and after convert to joomla.
i created a very successful site with Drupal.. I highly recommend it because of the power & features (Modules) available and because it is very SEO friendly.