Joomla and wordpress have there own pros and cons and I would share them with you here and it would be your personal call to go with any of the above.
1. Joomla websites looks much professional but when it comes to wordpress you would need a really good theme to make it look professional.
2. Wordpress themes most of the time w3c validated and is always good to have themes with w3c valid html.
3. Joomla SEO friendly hacks are quite a few and it may take sometime to know which is the best one for your version of Joomla
4. Joomla's functionality depends on the theme you are using but wordpress plugins are all same for standard plugins.
5. Wordpress is far simple to use when it comes to backend management.