I love the information Metzer provides. Under the Duck Information tab they have the following information: Breed, Temperament, Weight, Egg Prod., Mothering, Bluish Eggs, Egg Size, Fertility, APA Class, Foraging Ability, ALBC Status, Our Show Quality, Flying Ability, Origin. It is so easy to see the differences in the breeds, and the information looks to be extremely honest and I believe the info is based mostly on their own stock.
For example, want show quality birds, most of their birds are listed as average, probably you can show them but you will likely be in the middle of the pack when the judging is done. But the Cayugas are listed as Excellent Color, Good Type. Want a runner that lays bluish eggs, choose the Chocolate Runner. With all this information you can really choose a duck that will fit in your situation. And the ability to order by sex is fantastic. Small orders are also possible.
On the other hand Holderreads is also equally honest about their stock. And while they do not currently show the birds they are certainly experts and have impressive wins in the past and others showing birds from them win consistently.
I have never read anything on the BYC forums that indicates anybody has been less than happy with health and vigor of birds they have ordered from either hatchery.
I have the utmost respect and awe for both hatcheries.