Let's compare
1. Shallow - 1300M vs Feels 748M
2. ARUTW 505M vs Dark Horse 718M
3. Million Reasons 481 vs Roar 575
4. Bad Romance 465 vs Firework - 467M
5. Poker Face 455 vs Never Really Over - 440M
The fact Katy's #1 song is one in which she's the feature artist (and she only sings the chorus) isn't cute also, ROM is coming for the top5 very soon. When this happens 3/5 will be recent songs for Gaga while for Katy it'll be only 1/5