'Born This Way' sold 900K (3xPlatinum) without a re-release. Check your receipts.
Katy had better singles sales, but all you need to do is look at their tour dates there to see who is bigger. It's not like everything revolves around chart receipts. Gaga also has a 9xPlatinum selling album. Oh, and she was the theme of the week at the X-Factor (one of the most important shows there).
We all know she also slays Gaga in the US territory. Am I wrong?
Hence why Gaga is number 2 on the social artists right now, with no release, a media blackout, and no new album/single hype. Yet Katy has a brand new single and just recently performed at the Billboard awards and is at number 5.
Such U.S. slayage.