Released exactly a year apart from each other, both Katy Perry's lead for her #1 album PRISM, "Roar" and Taylor Swift's carrier single, "Shake It Off," for her forthcoming album, 1989, were obviously smash hits at first listen.
Both songs opened with astounishing first week sales of more than 500k. Had an impressive radio airplay and great streaming points. Also, both songs managed to topped Hot 100 for 2 consecutive weeks.
Based on their first month reception, which song do you think is more successful and will be remembered in the long run? Discuss.
Roar is so, so much bigger.