Whats the difference between sub-addresses and integrated_addresses?
Is one more useful than the other?
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Integrated addresses are just standard addresses but with an embedded payment ID. Anyone can decode the integrated address and determine the standard address it is associated with. However, when a transaction is sent to that integrated address, the payment ID is encrypted on the blockchain. Therefore no one (other than the private view key holder that issued the integrated address) can tell that the integrated address was used in a transaction.
Subaddresses are deterministically derived wallet addresses that are grouped by wallet accounts.
They are both useful, though subaddresses are newer and preferable in most use cases.