Well, if you want a MasterCard in the US your options are more limited but if you're otherwise happy, the Citi AA MasterCard seems an obvious choice, as noted above - it's essentially Citi's version of the same card. Citi also sucks. Not as bad as Barclay's tho.

If you want excellent customer service above all else (and great protections), Discover and American Express are fantastic choices. They aren't MasterCards though, and acceptance is more limited than MasterCard.

Almost all the good reward cards in the US are NOT MasterCard, sadly. I love my HSBC US MasterCard for service, and global compatibility (EMV contactless, no FTF). But only 1% cash back.