While everybody knows about Wordpress, most people never heard about Joomla, one of their biggest competitors. Joomla is also a content management system created for larger systems with hundreds of articles and if we are dealing with such amount of posts in Wordpress we experience some problems like slowness, while Joomla should be more capable of dealing with them.
Well, in reality, I never worked with so huge systems under my control, so I can't say if this is true. It's still great to have an opportunity for testing Joomla under their official site, like we can under Wordpress and here is my blog:
What you'll instantly notice is Joomla's lack of SEO efficiency. URLs of the posts are numbered by default. If you don't want these numbers, which are lowering your chances in the competitive world of search engines, you'll need to install a special widget or create a menu helping search spiders to deal with your posts.
It is doable, yet unnecessary investment of your time and energy. There are other problems as well (this robust system demands longer learning time than other blogging systems, file management is not nearly as easy and transparent as Wordpress's etc.).
While their content management system is often counterintuitive (to upload a picture you should, for instance, manipulate two sliders and jumping up and down, having useless options on the screen instead of simple and only necessary clickable buttons), in general, I am happy with my blog on Joomla. It's only one of supporting blogs where I can publish stuff which is not 100 % relevant to my main occupations. I recommend testing it, but not as the main blog and especially if you are a complete beginner in a blogging scene.