I currently have the US Airways Visa Signature card... and the US Airways MC does not have as good of benefits. Although I just realized that MC offers a free US Airways card… you only get 1 mile for ever $2 dollars spent though

I also recently got the SPG because of the ability to transfer to US Airways. With this card there is no reason to keep the Signature card... which I plan to cancel however it is my only Visa CC as of right now so I am going to hold on to it for a little longer.