I have fitted many a hinge to internal doors and always fitted them with the wing with most knuckles to the ... no lets wait for some debate before I own-up! I am only questioning it because someone asked me and realized I could only say that this is the way always do it but not give a decent justification.
Perhaps it simply a matter of preference or is there a view that they should they be with the wing with most knuckles be fitted to the frame or to the door and if so why?
Mike