When it comes to selecting a CMS in today's modern environment, you really have three main choices to pick between. First, you can choose to go with a basic but functional CMS like WordPress. Secondly, you can choose to utilize a more advanced CMS framework on the other end of the complexity spectrum, with Joomla being just one of many examples. Finally, you may choose to implement the needed CMS functionality on your own accord.
In order to be sure that you're making the right decision, you need to look out for a few key characteristics. The CMS that you choose needs to yield instant result through the entirety of the project lifecycle, from the first pitch to its eventual launch. Any high quality CMS deployment should also have on-demand availability. You shouldn't need to install any software, manage any upgrades on your own, look for available plug-ins and more. You certainly shouldn't need to purchase any additional hardware for your business to get the CMS off the ground. You should be able to load up your browser, sign in and start working.
The CMS vendor that you choose should also be able to display the flexibility that you will need moving forward. It should be easy to integrate and even easier to extend this functionality on an as-needed basis. Your CMS should also have a high degree of useful, prefabricated templates and widgets and support the integration of popular web frameworks like Bootstrap, for example.
Finally, your CMS solution should be able to grow and evolve as your business does the same. If you need to be able to reuse certain components from other projects, be they third party elements or your own, your CMS should allow you to do that. Most importantly, your CMS should require minimal operating effort through all stages of the project to truly allow you to create the high quality content that you're after.