I think Steph Curry's one of the most interesting point guards in the game, mostly because he is, far and away, the best shooter at the one spot in the modern NBA. He's like a smaller Ray Allen (Milwaukee era) with better handles and a green light in a much more uptempo offense.
That said, comparing 'better' between Rondo and Curry really does seem to be apples and chainsaws. Different systems, different strengths, different conferences, different sweatband preferences.