Sapphire Preferred.. sorry
-Chase Sapphire Preferred gives 1 CO mile per dollar spent, plus a 7% annual point bonus, plus it has return protection.
-Citi AA gives 1 mile per dollar.
Advantage: Chase Sapphire Preferred
-Both AA and CO miles are very valuable, but CO has the advantage of being part of *A which beats OW, plus CO has more generous routing rules.
-Both are very generous in allowing free date/routing changes to awards even after you book them.
-AA has one-way awards, but generally gives no free stopovers.
-CO allows a free stopover and an open-jaw.
Advantage: CO unless you strongly prefer one-way awards to free stopovers.
-You are limited to 100,000 miles per year on the Citi AA, there's no earnings limit on the Sapphire.
-You can transfer Chase Sapphire Preferred points to anyone's CO account, the Citi AA goes directly into your AA account.
Advantage: Chase Sapphire Preferred
The Citi AA card does have some other benefits, for example the personal Mastercard has free CDW in Israel.
All in all if you're not trying to hit any thresholds, I would say spend on the
Chase Sapphire PreferredOf course for stores that take AMEX, the advantage goes to spending on the
Starwood AMEX.
