I have had murderous buff orps, and I have one last Black Australorp who is """""" on wheels. She fought off a hawk last year and took 30 plus stitches to fix the gashes down her neck and the chick wasn't even hers. Friendly however, she is not. Lays like a champ.
So far the more of the Rocks...
Even within a breed some hens lay darker than others. My barreds lay a light to medium brown egg. My partridge rocks slightly lighter, except for a couple who lay darker. My blue rock a medium brown egg. My Delawares lay a brown pink egg, some lighter some quite dark. Answer it varies...