I'm often asked about my preferred software for building websites and it's often a question relating to Joomla and Wordpress. As a rule I use Wordpress for blogs and Joomla for other websites but to be honest, I don't really care.
There are armies of people with nothing better to do than argue about which software is better. One company who have had great success with Wordpress will swear by that and another whose Joomla website is ranking well will argue Joomla is better.
For me you can use Joomla, Wordpress, Drupal or any number of other great systems to build a website. So long as they allow editing of Title, Meta and H elements on a page by page basis along with sensible human readable URL's they are fit for purpose.
Of course it's always worth checking for any added functionality you need as Joomla for example may offer readily available tools that will solve your problems as might Wordpress for another scenario.
Ultimately your content and the way you promote your site will dictate the success it enjoys or the failure it endures. An all singing and dancing website with all the latest gizmos and wonder tools will fall flat on its face if your content is pants and nobody is looking for it.
Sweat your content not the trivial stuff like software.