Joomla and Drupal are the two most popular Open Source CMS's on the market.  That's not without reason.  They're both good.  There are lots of other CMS's as well, but we're not going to cover them in this article.  Here I want to discuss when to choose Joomla and when to choose Drupal.

Where Joomla is strongest

• Has the biggest and most active user community.
• Has the widest selection of templates available
• Has the widest selection of 3'rd party extensions available
• Is easiest to get help for
• Regarded as easier to use
• Free e-commerce extensions available

Where Drupal is strongest

• Easier for developers to create extensions for (although with the improvements of Joomla 1.5, that might not be a good argument anymore)
• Has an in-built version control
• Has a more flexible way of organising content than Joomla's section/category hierarchy
• Has a more flexible user and role system
• Best Search Engine Friendly URL's out of the box