Which OneWorld airline to code AA flights to?

I live in the US, and have qualified for AA Exec Platinum (OW Emerald) for 2018. I have also already reached the 200k miles mark, so have received the additional 4 SWUs. Now I see no reason to code my upcoming AA flights (NYC-PVG in J and NYC-MIA in Y) to AA.

Wondering what would be the best OW airline to code my upcoming flights to?

Often fly home to australia with QF/AA/CX, and fly to Europe with BA. All of these 4 airlines I already can transfer miles to with Credits cards, but wondering if anyone knows the best to code for status or max points.

Thanks in advance.

Are you likely to achieve this one day? It would be hard to do it with multiple airlines so i guess pick one that you likely can do it with.