I think, out of all the breeds I've had so far, my friendliest chickens have been very random. I do believe all the breeds can be friendly, depending on how you raise them.
My vote would be for my little Cream Brabanter, (a rare breed) who is sooo friendly and wants to be held. She DEMANDS to be held really. Will fly and land on my head if I don't pay her the proper attention. I hatched her though in my incy.
Also, runner up would the my golden buff hybrids, and I have several that love to be cuddled and petted, even as adult hens. The hybrids have several different names, golden sex link, red sex link, cinnamon queen...........lots of names that I can't think of right now....