Ah but see, the chart you referenced, the only thing that beat the KC in egg laying, were the hybrids (I think, I only gave it a quick glance, busy vacuuming dog dust).
I was only talking about purebred ducks (don't forget, our primary purpose was for showing, the eggs were just a bonus). If you're primarily going for egg laying ability, hybrids are the way to go, much like with most chickens. It's hard to beat the sex-links and production (hatchery) quality birds for shear numbers.
Variety of breeds/colors is what makes things interesting, everyone can go with what they like. Just like I am able to put up with poor laying in some of my breeds of chickens, because I just want to work with that breed. Other than our egg flock of 12 feedstore birds (as purebred as a hatchery bird can be), the rest of our birds are all from exhibition lines. So far, I'd give egg laying in my chickens to my campine, almost every day a large-x-large egg without exception. But then, many of my breeds haven't started to lay yet for comparison.
And Holderreads is a great place to research. All of our show waterfowl came from them (20 years ago) and his books make a superior reference. Great people to work with.
Deb