I used to use Joomla and Drupal when I needed a CMS and WordPress when I needed a blog, but not anymore. WordPress is all I use for all of my CMS needs. It's easily customizable, has a ridiculous amount of community support, an extensive collection of highly useful plugins that benefit it as a CMS, and is easily scalable. The absolute only place that WordPress falls a little short is anything beyond basic eCommerce needs.
i prefer use wordpress than joomla. its user friendly. I use it on most of my blog. animeku.com is wan of it
better off using wordpress, as the number of threats that comes with Joomla plugins and modules are way too high. and i think Joomla is way too heavy compared to Wordpress, weighing down much of your resources.
Definitely WORDPRESS! I have tried Joomla on many occassions and unless you are familiar with Windows Server its a bit perplexing.