BuddyPress.org

Edit: Just realized my post is possibly in the wrong group. Apologies!

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Hi all.
As a newbie who is comparing Buddypress and Drupal Commons, I would really appreciate your advice on which platform is more appropriate for an academic project I’m working on. The project involves three kinds of users:
1. Users who can post projects (Posters)
2. Users who can apply as them (Bidders)
3. Users who can sponsor these projects (Sponsors)

All these user types will have different pages, access rights,/ permissions, navigation menus, profile fields etc.
Which is a better platform for such a project- BuddyPress or Drupal? If there’s any additional information you’d like please let me know and I’ll immediately post it.

Thanks!!