I think that Hero was truly amazing, but with the focus on more social elements. CTHD on the other hand was a bit more personal, and aimed at personal philosopy(Taoism, traditional Chinese religion, etc). After having some great discussions with people ive conceded that I gave both movies a perfect score. I think they are breathtaking pieces of art. In the end its a preference of subject matter, and also possibly my great respect for Chow Yun-Fat.
-Lethe