Seems to me that overall the blacks are the darkest. My cuckoos have never laid very dark. Never had a blue, but there is a breeder by Boise that does the blues and the eggs look really nice and dark. -...I love my blacks, but (wow) I have a lot of black chickens lol. Will see! It would be fun to have some different colors...I am getting some wheaten Marans at chickenstock, I wonder what the babies would look like from those with the blue rooster? Also I was chatting with Michelle, I have a golden cuckoo Marans from her, and it would make sex link babies too! She lays really dark and big eggs
I would love to keep her genes going for sex links.
PS Don't forget I would love a frizzled turken if you get those two mating!