Good question...:2 cents:
I would have to give the very slight edge to
Gauge.
I know this sounds strange, but I havent seen alot of Sasha Grey.
Action:
Gauge played the "innocent" girl a little better. But Sasha has done more extreme scenes.
Looks:
Gauge in her prime, wins hands down. (no pun intended).
Dont get me wrong. I like both of them. I wouldn't turn either one away.