I don't think it matters. Assuming the outbox model works properly, your notes are fetched from your relay and served to viewers. You don't need to be posting to the same relays as viewers.
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To fetch notes from your relay they have to subscribe to it.
You can run a private relay for friends and family.
Outbox works differently. I have outbox relays set in my profile. A client that supports outbox will connect to them to grab my notes even if it is not in the users subscribed relay list.
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