Joomla and Wordpress both are different CMS portal, both have their own features. Basically the points of difference between them are:
1) Wordpress is more user friendly to normal users who dont know anything about web development, whereas Joomla is friendly with all type of Designers, Developmers, Administrators.
2) Wordpress is more preferrable for Blogging.
3) Joomla updates fixes it bugs, whereas Wordpress updates sometimes bring more bugs than fixes.
4) Wordpress is more
SEO friendly than Joomla.
5) But looking at future Joomla is a better option.