5 reasons main reasons for using Drupal

1.Advanced URL Control Drupal gives you very close control over your URL structure. Each item in Drupal can be given a custom URL.
2.User Management using drupal you can create as many custom user roles as you want. This is done using custom access levels
3.Custom Types and Views Drupal offers the Content Construction Kit that could be used to create advanced custom views and new content types without writing any code.
4.Revision Control Drupal gives you the ability to save a new version of your pages every time they are edited. So you can go back and view old revisions or revert back if you want.
5.Friendly and Large Community —Drupal forum is very active and it’s a great place to look for answers for your Drupal questions . for chat drupal support you can go to IRC chat, channels #drupal-support and #drupal-dojo .