I think Katara would win because she could freeze Sakura is a block of ice and she can bloodbend so Sakura would be beating herself up. There's more waterbending moves that could be used on Sakura, too. Plus, Sakura can only get you if she's close, Katara can do it from a distance. And she is smarter so she always finds a way to defeat somebody. But what do you think? Who would win?