Or who's better at hand-to-hand, lol. Two-handed swords can be tough in close quarters like this, but I guess it depends on who is quicker and the better swordsman or woman. Love the scene! 

A Rapier is for quick fighting, though I am not too sure if it would withstand a single blow from a massive Two-Hander, which gains momentum with its length and weight.

But after all, it is a fantasy scene, so everything is possible. The scene is really nice. And looking at the direction of the tilt (which I like as a means to show balances) I suspect that she is the defender.