⟩ But the expensive ones are better, right?
Not necessarily. The sales staff of the large enterprise content management vendors might be slicker, and their list of features longer, but to our minds the 80/20 rule applies to CMS very strongly: most people will only use the the most basic features most of the time.
A CMS that does the washing up and doubles on sax might appeal to the IT department looking for a single solution to keep the marketing department off their backs, but if it confuses people and never works well, it’s not worth the money.
A simple (and free) system like Wordpress or Drupal might well be all you need, even for a relatively complex site. And affordable paid solutions like ExpressionEngine, MovableType or CityDesk offer even more functionality and flexibility without what could be huge amounts of unnecessary expense.