Drupal 7 is what I use to create Websites. Some advantages of Drupal are:
- Free so there are no software licencing cost, or recurring monthly or annual fees.
- Open source and everyone is free to learn how to use it. You can update your own site when you want - where you want - without fuss.
- Used by some of the worlds biggest websites. see http://drupal.org/cases for examples.
- You are not locked in to one company to work on your website, you have a choice of thousands of programmers.
- Functionality is only limited by your imagination and budget. Nothing is impossible with Drupal.
- Drupal has an extensive and active community supporting it. It is constantly being improved and is subject to extensive testing so you can count on it to be safe and secure.
- Search engine friendly.
- There are multitudes of third party modules to choose from to extend Drupal.