duh, of course britney

Britney.

There's a reason Britney sold many albums and Katy many singles :P

What's the point of this thread when only Madonna and Whitney are bigger females than Britney?

Britney and it's not even close. Katy will hardly even outsell BOMT in her whole career :S

Britney

Then Britney
Now Katy
Overall Britney

Britney.

Britney and it's not even close.

All of Katy's albums since 2008 have outsold Britney's from the same time so what's your point?

Britney, obviously.

That Britney sold more albums, and Katy sold more singles I think. It was pretty straight forward actually.

Anyway Britney's bigger, but Katy will be remembered for the Teenage Dream era alone, and Dark horse.

Overall, Britney Spears so I voted her. During the present time, Katy Perry is more relevant than her.

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Britney lol

Britney. They're not even comparable.

Mariah is bigger than Britney tho

also Britney obviously.

Britney, of course

Britney but you can't really compare them

No one that debuted after Britney has a bigger overall career than her.

Still Katy probably has the biggest overall career out of the girls that debuted around her debut year.