Demaestro - 9:39 pm on Jun 25, 2012 (gmt 0)
It depends on what you want to do with it.
I wouldn't use WordPress to create a large e-commerce site but I would use it for a ma and pa bakery.
It also depends on what your level your programming skills are at. Joomla is good but if you don't have the knowledge to dig under the hood and customize it by extended default classes, overriding templates and creating custom plugins then you are going to get frustrated trying to do some high level things.
The major downside to Joomla is a massive lack of documentation for doing backend customizations or even developing plugins. a full list of system events for the 2.5 is almost non-existent not to mention a slew of other things that would be nice to know about.
If you go to the official Joomla wiki most pages relating to the 11.5 (versions 1.6, 1.7, 2.5) platform are blank or not useful.
If you don't know how to program very well and you aren't doing any enterprise level websites then I would go with Wordpress as well.