I'm mixed and mostly brown. Personally I find really good chemistry with most asian women, and maybe it's a combination of my own attraction to them plus cultural similarities.
I find brown girls are a hit or miss - the brown girls that are smart and take care of their physical/appearance can be some of the best girls in the world (physically, sexually, personality), with big features (ass, tits) and skinny bodies, and caring personalities. I've seen them have a mystical effect on the men that they're with. On the flip side, a lot of brown girls simply aren't like this, yet they're usually very repressed and extremely horny which makes for some wild sexual adventures with them. A lot of other brown girls just don't take care of their appearance, and they're physically unattractive. A lot of other brown girls seem to fetishize white guys and whiteness. So they're kind of all over the place, honestly.
Generally these days I don't hook up with brown girls (latinas yes but not Indian women) as I don't find many that are attractive enough - and many of the other ones just blow me out off the bat. I guess there's some big attainability gap in my vibe with them, lol...