This is a really hard question. I think both of them are going to be extremely successful with their next albums, but I choose Gaga this time. She has a massive stanbase waiting for her new record.
It'll be the usual. Katy gets her .69 cent deals and slays in singles. Gaga will get more critical acclaim and her album sales and touring receipts will trump Katy. So Gaga
It'll be the usual. Katy gets her .69 cent deals and slays in singles. Gaga will get more critical acclaim and her album sales and touring receipts will trump Katy. So Gaga
Oh and I guess Gaga's .99 cent makes her album sale more.
Album sales: Katy
Media attention/"impact"/notoriety: Katy
Singles success: Katy
Touring: Gaga, but not by much
Critical Acclaim: Gaga, Katy in the long run