CiviEngage is Drupal-only (not something I'm looking at using though). Drupal integration also includes integration with views, a CiviGroups Roles Sync, or an Organic Groups sync too I think. So, just a whole bunch of ways to integrate CiviGroups with Drupal roles/access, and then to pull information from Civi for custom display in Drupal. I think there's even a webform integration module.

WordPress can do all the basic stuff, like display profiles or CiviCRM pages or whatever, but you don't have the same potential to integrate content/permissions in both directions like you can in Drupal.