The one that grossed over $120M.
I think it's a stupid poll. They're all slaying in their own right:
Beyonce: The performer of our generation, a "local" artist doing what she does best and receiving rave reviews and stellar numbers while doing so... over a decade into her career
Taylor Swift:23 years young and already selling out stadiums and proving her doubters wrong while transcending out of the United States.
P!nk: the underrated gem who's been around for over a decade, putting up record numbers in Australia, receiving rave reviews, putting up monstrous numbers, and doing so effortlessly
Rihanna: proving her doubters wrong and clocking her first 100M+ tour, selling out stadiums on multiple continents, 8 years into her career at the age of 25
I mean you can look at overall gross, averages per show, overall attendance, and average ticket price but it's all really circumstantial.