I have used both WordPress and Drupal and they are pretty good. I leaned towards Drupal more, for its flexibility. Grav is superb for my needs. Lightweight, fast, very few requirements, its the best platform to use for what I am doing. However, for all those benefits, there are limitations, and to me, themeing and documentation are a pain. However, it is the best flat file CMS hands down.
This seems to be the way. Panel beating Grav. Dang. Wish it were more friendly, but still much respect to the development team.