Hi, long time Drupal dev here (http://drupal.org/user/404732 http://drupal.org/user/404732). The answer to this depends on these questions: 1) Do you have a pr

Hi, long time Drupal dev here (http://drupal.org/user/404732 http://drupal.org/user/404732). The answer to this depends on these questions: 1) Do you have a pressing need to get a site out the door in the next 3-6 months? (i.e. a client that wants the site done or similar) 2) Are you already experienced with other PHP frameworks/libraries, particularly those from Packagist? There may be other factors, but I'd say those are the two big ones. Answers: #1 yes, #2 yes: Maybe use Drupal 8, but be prepared to port modules from D7 to D8. This is not a hard thing to do, and it's reasonably well documented, but would impact your timeline. #1 yes, #2 no: Use Drupal 7. Deadlines and inexperience are not a good place to try something that only hit rc this month. #1 no, #2 yes: Use Drupal 8. You're exactly the kind of person that would benefit from jumping into D8 a little early. #1 no, @2 no: Use Drupal 8, and expect a steep learning curve.