In my humble, CX J lounges are superior to both QF J and Centurion lounges, with the CX Pier J lounge being the stand out. As suggested previously, if time permits, do a ‘lounge crawl’ and check out all of the CX J lounges.
Being a business class passenger travelling on a Oneworld airline you have access to many lounges, including the Centurion Lounge. Why not try them all and report back which you enjoyed and which you didn't.
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