In terms of TEAs in the U.S.:
Katy Perry
PRISM – 1,308,000 albums sold
“Roar” – 5,377,000 singles sold – 537,700 albums sold
“Unconditionally” – 1,039,000 singles sold – 103,900 albums sold
“Dark Horse” – 5,025,000 singles sold – 502,500 albums sold
“Birthday” – 234,000 singles sold – 23,400 albums sold
Total – 2,475,500 albums sold
Beyoncé
BEYONCE – 1,960,000 albums sold
“XO” – 400,000 singles sold – 40,000 albums sold
“Drunk In Love” – 1,420,000 singles sold – 142,000 albums sold
“Partition” – 349,561 singles sold – 35,000 albums sold
“Pretty Hurts” – 50,000 singles sold – 5,000 albums sold
Total – 2,182,000 albums sold
They’ve both sold 1.7 million outside of the U.S. Katy has sold considerably more singles outside of the U.S. this era. Katy is also gaining more TEAs at a much faster rate. All single/album sales are from the official era threads, except I made up 50k for “Pretty Hurts.”
Katy is undeniably having the bigger era, though both eras are massive.
if so then the loud tour was part of the TTT era and the monster ball was part of the BTW era