There were a number of tradeoffs in choosing to get AA credit vs. TW credit over the past few months.

In favor of AA, your miles counted towards free upgrade certificates. In favor of TW, they still offered the 750/1000 mile minimum per flight compared to AA's 500 mile minimum.

Because I've taken few short haul flights in the past few months, all my credit has been towards AA (especially considering I would get a 25% bonus as TW Elite vs 100% bonus as AA Platinum). Never did I have any problems getting my AAdvantage number put on my record.

Greg