Nowadays it is impossible to built serious site without choosing software for its support and update.

Notion Content management includes  wide spectrum of software nowadays, from the set of short scripts allowing to add news or press-releases on one page of site, to valuable publishing systems supporting the processes of workflow (chain author-proofreader-editor), providing different charts of access differentiation, automatically creating the "linked" documents, etc.
The choice of the best CMS (Content Management System) for your project (or corporative site), first of all depends on your budget, expected complex of he site and technical providing. Instead of just comparing possibilities of different CMS, you should decide what you really need. Before choosing software or company which will create it read and think about  few questions which will help you to define the parameters of the future system and your Requirements. But you should remember that there is no universal CMS and software without defects.

1. what do you want to purchase: software or service?
Some systems are supplied as they are. It means that you, or your employees, set SOFTWARE on a server and adjust it in accordance with your requirements. Other class CMS is usually disposed on technical powers of system developer. Access to the site management is given through internet, with a help of standard browser. The last developments realize possibility of on any term SOFTWARE rent, and usually claim less attention and technical support Purchased or made under the CMS order from gives you the complete control of site. But do you have possibilities to maintain expert-developer, time and money to get a return from the hard Software? Do not try to make a little tiny hole in a wall by a mechanical pick.

2. Ask a developer, how CMS creates the pages of site. Are standard HTML pages created, or generated dynamically in demand of site user?

Most of the CMS keeps information in databases and creates the pages of site "on fly", on demand of visitors. Such work scheme is justified, if information on a site changes often (more frequent, than one time per a day) or a site is the difficult personalized web-system. However such decision requires considerable calculable resources. Having great deal of visitors (the critical parameter of visited depends on many factors: configurations of server, possibilities of programming languages, system is written on, qualities of CMS programming), as a result is a site downloads slowly, visitors are unsatisfied. It is needed to notice that at visited 10-500 hosts in days, this, probably acts no part.
More complicated systems have built-in mechanism of cashiering and regeneration of static information. The pages of site are formed once: after changes made by user in CMS or at the first address of visitors of site to the page. In future, up to a new change of information on a site, once generated page is given out to the visitors. That the addresses to the databases almost do not take place. That reduces loading on a server to comparable with standard.

Advantage of pregeneration pages (not cashing!!!) is that pages are static in fact pages are indexed fine by searching machines. It helps you o find additional visitor for our site.
Although, nowadays, searching robots get along fine with fully dynamic site.