"Best" way to handle Auth & User Collection

Hi All!

I'm trying to figure out the best way to "link" Accounts and my user collection. I know I can't link them with a relationship. I appreciate your thoughts on the "best" way to handle this!

When I create a new Account user would it be best to?

1. grab the account user's id, and set the new user documents id === account user id

2. grab the account user's id, let the user document generate a unique id, then toss the account users id into a property on the new user document. Such as "account id"

3. Link the 2 with a 3rd collection. User Id generates its own unique id. The third document just has 2 properties:

4. Account id

5. User Id

The first option seems more efficient. And if I'm not misunderstanding something, someone would need the session data/secret not just the user id to really do anything to the Auth Account right? So 2 and 3 just seems to add extra complexity?

(I'm using Next.Js 15 if that changes anyone's answer)