GaGa vs Britney vs. Avril vs. Katy vs. Ke$ha vs. Rihanna vs. Kelly Clarkson vs. Beyonce vs. P!nk (?)
I'm predicting Gaga, Bey, & Pink will have the most success.
Avril? Ch..
Unless Britney actually gets off her ass and promotes this era will most likely be a repeat of Circus. A debut at #1 followed by some longevity in the Top 10 and & little over 4 mil sold by the end of the era.
Katy? Eh.. Is her current album even moving any units? It'll probably underperform and sell less than Rated R.
Ke$ha, meh. More hit singles, decent sales.
As for Rihanna LOUD will definitely outsell Rated R. This album could dominate WW if her and the label play their cards right.
Kelly Clarkson? Lol, RCA isn't here for her anymore.