Three different lines, similar applications, but not quite close enough in my mind to be interchangeable. Majority of my experience with the saddles (never thought the capes of much use), but I have all three products, so here is my take.
Coq de Leon is descendant from the European line of that name, and a fairly new introduction to US. Large saddle feathers that make great nymph legs, but a bit too much for anything but very large soft hackles (think big Indian hen saddle).
The Brahma line has similar coloration to CDL, but is a smaller feather and bit more useful for tying soft-hackles for me in reasonable sizes. Not sure exactly the origin of this line, but I believe this is a long-standing domestic strain that has been reintroduced.
Finally the so-called "Soft-Hackle with Chickabou" is descended from the Henry Hoffman line/product of the same name (although FE says they are also from the Miner line, which I cannot comment on). Hoffman worked with Whiting to develop this line, then finally sold the line to Whiting a time ago (you can still find Hoffman's original product around if you look hard) and it is a saddle with the "chickabou" attached, which as Bruce pointed out is just the chicken equivalent of turkey marabou. The large-feathers of the Hoffman line are "soft" but not really as useful for soft-hackles as say as a Hungarian partridge (closer to the Whiting American Hen Saddles by comparison than either of the other two products). The chickabou is essentially a light marabou substitute, and useful for bodies and such.
I cannot speak to the nature of the CDL or Braham chickabou because none of the commercial saddles I have came with it attached, so I'm not sure if this is a new product, or something that Dave at FE has exclusively, due to an arrangement with Whiting. Probably best to email him directly (very helpful guy) if you need further clarification, Ray.