They are very clever, too. Cuddly is a tough one in any bird, but if you handle them a lot as chicks, maybe? My friendliest by far is a Barred Rock, which isn't "typical" of the breed.
I really enjoy Appenzellar Spitzhauben. Blue Australorps are very good birds, too, and very pretty. And who can resist bantam Cochin s?
My Leghorn is a nice girl, but she's not a lap chicken. I think that level of friendliness comes from a combination of genetics and handlung.