Both WordPress and Joomla are complex CMSs, you can create and manage just about any type of website using them. In some ways, Joomla is more flexible than WordPress, however It beats out Joomla when it comes to SEO, customization possibilities, and content management.
Also voting WordPress. While there's always some subjectivity in making these choices, I'd think that WordPress is slightly more user-friendly. Additionally a news site is actually closer to its original purpose, blogging which makes life a bit nicer.
Wordpress would be the ideal choice considering how easy it is to design a website using Wordpress CMS as compared to Joomla. Joomla seems a bit complicated to me. You also have a lot of options to customize Wordpress without any hassle.
I think that WP has more friendly approach to the end user and there is super nice plugins that make it into very simple build a web page, almost like a lego. Example of such builder you could find from ElegantThemes.