You’ll probably recognise that this and others that we use are WordPress based blogs. Why have we settled on this CMS ?
It is just easy to use. You don’t get many shocks or surprises with the layout of your posts (i.e. your articles). Sure, it hasn’t the sheer quantity of functionality of our other favourite, Joomla, but if you just want to be able to get your message onto the Internet without a steep learning curve nor with onerous support requirements then you can’t go wrong with WordPress.
If you want to create many users and have a much more complex set of permissions then you need to look towards something like Joomla. In the end it will depend upon your requirements. If those are not clear then you could end up with the right solution but it’s fixing the wrong problem !