Hi,
actually I would decide between archive or delete if at some point the archived cards could be back to the board again. If you are 100% sure that this will never happen then I would go for Delete.
i leave you here a link just in case you want to read more about archived or delete:
https://support.atlassian.com/trello/docs/archiving-and-deleting-cards/#
Cheers
Toni
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