There are a number of features to look for in a CMS.
-Easy and Quick Installation
-Easy administration interface
-Supporting user community
-Availability of extension of CMS
-Easy template manipulation
-Scalability-The CMS you choose should be able to grow with your expanding business.
-Customization-It should allow manipulation of design, structure and the order of the content for unique visualization.
-Security-A CMS you opt for must account for security and should have features to ensure maximum safety.