From my experience, white chicks tend to be a lot more emotionally into it I guess? I can only think of 2 white women I slept with who didn't drop the "L" word within the first 2 times of me hitting it. As a contrast, only 1 other black woman (besides my current) dropped that on me so soon.
Black women seem to have better orgasms. You guys are more capable of doing that thing where you cum, hard, and then fall into that "Don't you fukking touch me!" coma. I've had 3 black women who I could make squirt and only 1 white woman.
White chicks tend to have a softer touch and better vaginal hygiene as well.