[Twinny]

For me, both files and SQL works since I load them into a DBNPC. Both ways work since it's a one off read. SQL seemed pretty slow when dealing with alot of requests for me (which was really weird) so I wouldn't recommend storing and reading items out of it constantly.... works really well for logs though =D

For ease of use (and the fact I don't use the files live) I recommend file based