I guess I should elaborate a bit more here. James Harden is the perfect compliment player. He can pass, shoot, dribble, and even defend a little. Now, the reason I would not trade him for DeMar straight up is because of the potential DeMar possesses. This kid wants to be the best, and knows how hard he has to work to get to that level. And with that athleticism he has, I can see him someday becoming a very dangerous threat on the offensive side of things, and hopefully on the defensive end as well.
I can see Harden becoming a Ginobili type player, while DeMar has a chance to be an elite level player if he can put it all together. Call me crazy, but that's my honest opinion.