User.groups.add() or Group.users.add()?

[markkuleinio]

root@netbox-lab:/opt/netbox# venv/bin/python netbox/manage.py nbshell
### NetBox interactive shell (netbox-lab)
### Python v3.11.2 | Django v5.2.8 | NetBox Community v4.4.7
### lsapps() & lsmodels() will show available models. Use help(<model>) for more info.
>>> u = users.User.objects.get(username="admin")
>>> g = users.Group.objects.get(name="Test")
>>> type(u.groups)
<class 'django.db.models.fields.related_descriptors.create_forward_many_to_many_manager.<locals>.ManyRelatedManager'>
>>> type(g.users)
<class 'django.db.models.fields.related_descriptors.create_forward_many_to_many_manager.<locals>.ManyRelatedManager'>
>>> type(u.groups.add)
<class 'method'>
>>> type(g.users.add)
<class 'method'>
>>>

Is there a meaningful difference between the_user.groups.add(the_group) and the_group.users.add(the_user), which one should be preferred?

Btw User and Group are not documented in https://github.com/netbox-community/netbox/blob/main/docs/development/models.md, should they be?