DirectAdmin is awesome. Granted it's jail/shell is tricky, but no-one uses that now that CloudLinux CageFS is available.
DirectAdmin is very flexible in the way it can be made to do things differently.
For instance, our NGINX -> Varnish -> LiteSpeed hosting stack was quite easy to implement without 3rd party plugins (or Licenses to pay).
(DirectAdmin now supports NGINX as a proxy for Apache/LiteSpeed out of the box, and now supports Comodo WAF either on the perimeter NGINX or at the Apache/LiteSpeed end, out of the box).
Their spam fighting has recently improved as well.