I have been very casually working toward a line of chocolate silkied Serama, but the feathering has been a disaster. I know chocolate tends to cause feathers to miss molting and thus look ragged, but it seems in my silkied Seramas it causes a lot of the feathers to not lose their sheath. My tiny little girl has thick, ugly sheathed tail feathers and her head is full of pin feathers. I tried to help her with them, but she didn't have much patience for the unpleasant process. She was visibly uncomfortable.
I think blue silkies are beautiful, so that is what I would recommend. I have what I thought was a blue barred roo, but he has never fathered any blue offspring, so he is probably matte black. Too bad, as I wanted to work with blue plus chocolate. Just as well. I need to keep my numbers down to a manageable number for me!