I have had a few darks and lights and one buff hen. In my flock, the buff has always been stand-offish, the darks have been the friendliest, and the lights somewhere in between. I had a light Brahma pullet who would sit on my lap whenever I was outside. That stopped when she grew up. Now she will let me pet her but doesn't go out of her way for attention. The friendliest I have had is a dark Brahma rooster (yes, rooster). If I was outside on the swing, he was either on my lap or beside me. He came when called and never flogged or spurred us. We sold him for "big bucks" and have missed him ever since. Our dark Brahma hen, Frack, is also very friendly and tame, but doesn't like being held. She comes when called and will allow herself to be petted but complains when she's picked up.
We also have partridge Brahmas and project colors, but the darks have always been the friendliest in our flock, including two little cockerels that we have right now that love to be on my lap, maybe because it's cold out there and my lap is warm.