Miley had hits, in your face exposure, and came out a month earlier than ARTPOP even, yet ARTPOP already surpassed Bangerz WW sales.
LET ALONE Prism, which holds the torch as far as these three albums are concerned.
PRISM has sold my records and Roar is more successful than We Can't Stop or Wrecking Ball.
But Miley has had more impact in one performance of a than Katy will ever have with this era. I think they are about equal.
