All of them was sounding like they were struggling and it was really shaky but i'll give that to Rihanna You Could have picked better recent videos tbh
Rihanna>Katy>>>Britney (She was sounded like she was trying too hard very shaky, Her vibrato was not natural)
The Britney stans are here so she probably going to win tbh
Rihanna easily. She slayed at the Billboard Music Awards while Britney lip-synced. Not to mention her vocals on California King Bed on American Idol alone >>>>>>>>>>>>>>>>>>>> any Britney or Katy vocal live performance.
Was hard between Rihanna and Katy... Both of their UK X Factor performances are among their best (Katy's TOTGA and Rihanna's WMN), but had to vote Katy. That performance (X Factor TOTGA) was beautiful and really proved that she can sing.
???
You Could have picked better recent videos tbh
Rihanna easily. She slayed at the Billboard Music Awards while Britney lip-synced. Not to mention her vocals on California King Bed on American Idol alone >>>>>>>>>>>>>>>>>>>> any Britney or Katy vocal live performance.
Can a mod change my vote to either Katy or Rihanna plz 
