Drupal vs WordPress
Why they are always lumped together makes sense. They are both free to use, have a large library of plugins and modules to add extra features, have loyal users and developers to follow, and are both open source technologies. They were released only a couple of years apart, but over the years, WordPress has become much more successful.
WordPress and Drupal are both excellent tools and are suitable for various website forms. But in several big respects, Drupal and WordPress vary as well. A role in which CMS makes the most sense for you will be played by your individual website needs. Here are infographic about distinctions between WordPress and Drupal.