I still don't get what kind of odd comparison this is. The only reason why compere those two is to shade one of them. Of course Pink is charting well or better in some countries because she is much more popular there while in some countries Kelly is pretty much ignored (France, Italie...). If you want an exemple, in Czech Republic charts pretty high every **** Pink does (even Heartbreak Down charted

) while Kelly is the girl who sings Because of You (and Stronger). However, I still think Stronger was bigger and had and still has much bigger impact.