Not saying Curry is the best player of the era, but teams hunted Curry, not because he's a terrible defender (he's been average for awhile now and I'd say above average this year), but because he was often just the smallest and is usually surrounded by above average to elite defenders. Klay, Iggy, Draymond, Livingston, Wiggins, GP2, Porter. Teams also wanted to tire Curry out as well.
So I don't think the fact that teams "hunted" city should be held against him. He's not a bad defender at all. It's not a huge leap to say his impact on his teams offense is larger than LBJ. So overall the net impact to winning is closer than just simply LBJ is elite on both ends and Curry is only on side.