According to various metrics and measures of popularity:
-Music Sales: Katy Perry has sold more albums and singles worldwide compared to Selena Gomez. Perry has released six studio albums, with her album "Prism" selling over 12.5 million copies globally. On the other hand, Gomez has released four studio albums, with her most successful album "Revival" selling over 2.5 million copies worldwide.
-Concert Attendance: Katy Perry's concert tours have consistently drawn larger audiences compared to Selena Gomez. Perry's "Prismatic World Tour" grossed over $200 million, while Gomez's "Revival Tour" grossed over $120 million.
-Social Media Following: Katy Perry has a larger social media following across platforms compared to Selena Gomez. As of 2023, Perry has over 153 million followers on Twitter, 103 million followers on Instagram, and 33 million followers on Facebook, while Gomez has 65 million followers on Twitter, 388 million followers on Instagram, and 93 million followers on Facebook.
-Overall Public Recognition: Katy Perry's name and music might be more widely recognized by the general public than Selena Gomez. Perry's songs have received more nominations and awards at major ceremonies such as the Grammy Awards and the MTV Video Music Awards.
Based on these metrics, Katy Perry appears to have a wider reach and broader popularity on a global scale. However, it's worth noting that both artists have unique fan bases and excel in different genres of music. Ultimately, personal preferences and subjective perceptions of popularity may vary among individuals.