Although WordPress is the most used, it is not necessarily the best solution for every web site.
Over the course of the past 20 years, we've found that the framework within Joomla is the best solution for every business that needs something beyond a blog or 'brochure' site.
Joomla provides a very stable and secure structure on which we can create very customized sites for clients of all sizes and types. And when we need to create custom functionality that nobody has created yet (i.e. custom programming beyond just installing an extension) we have found that the Joomla framework allows us to create those customizations more quickly and securely than WordPress or any other web system.