Intranet Distribution Option

I’m reviewing what Druapl distribution to focus on and use to demo an Intranet solution to client. Kindly help recommend from your experience between these three (with steady maintainance):
1) Open Atirum
2) Open Social
3) Open Lucius

What I’m looking for is a solution that is not complex, easy to tweak technically (customization) and user friendly with good UI. Built on Drupal 7 preferred.

I’ve looked at a couple besides but many are no longer been maintained but if you have any other that will enable collaboration, document management and all the social spec do recommend as well. Thank you.