WW: No
US: Yes
SIO is about to sell 5 million in the US, while Roar has 6 million downloads.
But SIO comes from album that sold 5M, while Prism sold 1.5M.
Since we are talking about digital sale, digital sale of the albums should matter cuz people bought it digitally just like how they downloaded the songs.....So let say half of the album sales are digital sale.
SIO 7.5M vs Roar 6.7M
So in the US, SIO > Roar.
Taylor is no match for Katy when it comes to global sale tho