Last time I looked WN didn't fly international, so a no-brainer. Stick with AA. PP is good enough unless you can use the CC to add to the LP balance to make it over EXP but not worth what it used to be. Helps that you are already Marriott PLT but I would use it for all it's worth as sometimes elite benefits don't get recognized with Advantage Hotels as many programs want direct bookings, unless you are a regular customer so CRM kicks in. FC lounges are sometimes worthwhile to use, QF FC at LAX, SYD, CX Wing/Pier at HKG, BA FC at LHR etc. that have appreciably better food and amenity wise.

Also, check out qualifying on AS as they don't require as much and it's easy to get Emerald on them. Same thing, different member of OW, plus the 50k bonus makes it worthwhile..