Jessie J Covers Miley Cyrus's "Party in the USA"

Jessie J talks about writing "Party in the USA" and how it was a cool song but wasn't edgy enough for her album. We now know that that song hit number one on the charts sung by Hannah Montana star Miley Cyrus. At a show for a radio station, Jessie J performed the song much to the delight of the crowd. Who do you think sang it better?