Question on the user auth model

I'm reading the django docs, and I come across the following:

from django.contrib.auth.models import User

class UserProfile(models.Model):
# This field is required.
user = models.OneToOneField(User)

# Other fields here
accepted_eula = models.BooleanField()
favorite_animal = models.CharField(max_length=20,
default="Dragons.")

But, I've also seen it done this way:

class UserProfile(User):
# Other fields here
accepted_eula = models.BooleanField()
favorite_animal = models.CharField(max_length=20,
default="Dragons.")

Are there any differences between the two ways?

Also, can someone explain to me the post_save concept?

def create_user_profile(sender, instance, created, **kwargs):
if created:
UserProfile.objects.create(user=instance)

post_save.connect(create_user_profile, sender=User).
Would this function work with only the first UserProfile class above?
Or will it also work with the second UserProfile Class. Thank you.

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