Subclassing: http://scottbarnham.com/blog/2008/08/21/extending-the-django-user-model-with-inheritance/
User Profiling: https://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users
Which one is more efficient and less of a hassle?
而且
Which way should I go if I plan to scale big?