I am platinum on both. I care alot about getting upgraded, you have to pay for your upgrades on AA and they are free on CO, so I have to pick CO on that alone. CO releases international Biz and FC flights for awards 2 weeks before departure so I have been able to redeem last might int'l flights for regular mile prices. On the other hand I value CO points less than AAA since I have amex miles that can become CO points, but not AA.