Drupal : Open source CMS

I have looked at Joomla and Drupal over the years but as a custom CMS provider i have never really got into using either of them for a job. I recently manage to get a short (6 week) Drupal contract due to my expirence of ecommerce and php.
In this project i helped to set up the new Drupal installation and researched what modules we would use to facilitate the ecommerce. In the end it was nessecary to take a module and extend/ rewrite it to allow subscription payments with world pay.