Lee is a former all-star, great rebounder, and crafty scorer. Barnes is a young talented, defensive player still with the potential to improve.
However, I am not sure what direction Danny would be aiming for if he made this trade. They are both good players, but Lee doesn't really move the bar for us and Barnes seems a bit limited - just doesn't scream all-star to me (although I could be wrong).
As a win-now move, I honestly consider Lee the better player even though his contract is atrocious.
I am hoping for something bigger this summer.