Due to very scalable and dynamic structure with easily available plugins, the development in drupal become very cost effective.
Drupal provides large number of plugins and modules to increase the performance and functionality of websites as per the requirement which makes it highly scable CMS
Security is the key specification for Drupal. Any kind of security breach is not possible. So confidentiality and data security are better than other CMS.
Drupal provides awesome user experience through it's attractive layout and UI/UX