I learned the Hendrickson recipe as using bronzed mallard flank and used it exclusively.
I save Wood Duck for Light Cahill recipes/variants.
Don't think I can ever recall buying any bronzed mallard flank - I used to hunt ducks regularly - but for color palatte, it matches well with a good dark rusty dun hackle and black thread.
For body dubbing I prefer to select from raccoon underbody. I've gotten used to it and it dubs tight and strong and accepts floatants very well and naturally comes in a fairly wide variety of shades - from pale to almost black. It works with the Hendrickson dry sizes I used - 14 and 12 regular shank.