Retrieving objects from their ids: Contained in vs Fetch all

Hi, I am wondering which method would be most efficient in the context of this use case. I will have an array of object Id’s and need to get the User object associated with each one.

Would it be better to straight up use a contained in query or create a User object with each id and then use fetch all to retrieve their data which I read somewhere is equivalent to an equalTo query for each object Id.

Or is there a better approach to this, I’ve just started learning Parse and have got a lot to learn when it comes to optimizing, any help is much appreciated, thank you!

The containedIn is more intuitive for me and it should have a very good performance.