Extending User object in Django: User model inheritance or use UserProfile?

Question

To extend the User object with custom fields, the Django docs recommend using UserProfiles. However, according to this answer to a question about this from a year or so back:

Answer 1

Here is what James Bennett says in this blog entry about model inheritance:

I’d wager that probably 90% or more of the things people say they want to do with subclasses could be better accomplished by instead defining a related model and linking it back with a unique foreign key.

So I believe the best way to go is still to use an external app, such as some components of Pinax, or the django-profiles app (originally from the same James Bennett).