Time machine backups for 2 people on NAS - limit TM space

Hello, I’ve set up Time machines from 2 people/macbooks onto the NAS and it works well.
But I need to limit the amount of space the time machines take up and this article from Synology specifies 2 different methods - assign a user quota or assign a shared folder quota.
Which is the better option?
Thank you

I always just assign a quota to a shared folder and use that shared folder only for a single time machine.

It tends to be the cleanest way in my experience

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Thank you Will.
Have now put a quota on each shared folder.