Indian dude here, I've always found brunettes (especially if they were white but with darker features) to be a lot easier than blondes but I've been having a bit of success with them recently as well.
I get a lot more IOIs and at times even approaches from brunettes, find them to be a lot more receptive on average. With brunettes, I feel like I can get higher quality for the same amount of work I would put into getting with a blonde. The amount of work I put in chasing a blonde 6, I could get a brunette 8.
Majority of my success has come from tanned brunettes with darker features, along the lines of a Gina Carano type, though every now and then I might get lucky with a blonde.