wordpress is best for me because i dont have more requirements just plain blog posts if u have advanced site usage then joomla will be good
depend on what you want wordpress is better if you just need content feature but Joomla is the best if you want more features
For shopping cart and other hot requirements i love joomla.Drupal not bad. Word press is very good for blog sites.
I personally find Joomla has a less steep learning curve when compared to a cms such as drupal. Joomla also has great 3rd party support.
joomla really nice cms for me, i had many experience with it's and it's also give me much money...simple but powerfull..
Have experience with Joomla 1.5 and find it easy to use. You can also add Artisteer, which makes it even easier, not only of Joomla but wordpress also.
Wordpress simplicity and the availability of support community including plugins has made me chose it.
Joomla, I've tried do many and allways go back to Joomla, it's easy to use, low learning curve, resource use is minimal.