Why Drupal was chosen: 

We have been working with Drupal for many years and we proudly introduce it to our customers. Drupal's flexibility is the main argument which made us work with it everyday.
Thus, it is obvious we had to choose Drupal for our website as a showcase.

Why these modules/theme/distribution were chosen: 

Somehow, we consider these modules as what we call our "drupal core". Every project started is made of these modules.