I think any attempt to categorise the music of either Joy Division or New Order is a waste of time. Why do Americans (and those from above the northern US border) have to put everything into a neat genre? It's bollocks!
Joy Division was a hybrid of the diverse listening tastes of four individuals, each of whom had his own preferences. When combined with the location and socio-economic climate in which these individuals existed, they created some music that wasn't punk, it was different. They may have been galvanised by punk, but they had left punk behind before they played their first gig.
New Order took what they had created as Joy Division and added new layers, different colours and different shades. They added in new and more diverse reference points, continuing the original flirtation with electronic music and using it to create new sounds. They embraced technology, everything they have ever done has been using the latest gadgets and gizmos, no retro gear to be seen here. At every stage they have pushed back the boundaries, broken new ground.
How the hell do you categorise that? You can't. New Order are New Order.