Gaga's - it literally is a fan favourite moment for SO many of her fans and still to this day remains one of IF not her most iconic performance.
Honestly all I can remember from Katy's was left shark... I feel bad for her cause the media literally ran with that image
her fans will come here and defend the numbers and records she broke etc etc, but literally Katy was outshone by a backup dancer dressed as a fkn shark
I'm not saying Katy's was bad at ALL - in fact it was fun (from what I can remember whilst watching it) but it definitely isn't iconic or something that sticks in the mind.