Originally Posted by nux

You are really asking 2 questions:
1. Which OW FFP should I join
2. Which OW Carrier should I fly and has better hard/soft product

The answer to #1 I would say is to join the AA FFP.
#2 as I said, CX has a better product, but prices can be higher. But there is no reason you can't chop and change between the OW carriers based on schedule, price, etc.