Joomla! is a platform that gives far greater choices regarding security,, especially when it comes to website access for admin roles and customer roles. This functionality is an out-of-the-box feature.
There are many more possibilities for taxonomies too. Taxonomies are ways of sorting, defining and filing your content. WordPress for example has posts, categories and tags out-of-the-box whereas Joomla! allows you to define virtually any way of achieving your requirements.
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