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I was attempting to answer your question as I understood it to be.
Absolutely, if you order from a hatchery you'll get only production quality birds, like Saladin and Illa said. They may be be of a "standard" or "heritage" breed, but they'll not be "Standard" quality. "Heritage" refers only to the breed in this case, not the quality of bird. There are "standard" breeds and there is "standard" quality of breed. Yes, it gets confusing, because there is "standard" quality and there are "standard" breeds. And the terms Heritage and Standard are often used for both.
But if you're ordering from a hatchery, you'll get production quality birds no matter the breed. If you get them from a breeder, you'll get standard quality, be it a heritage breed or not.
Hopefully I've been able to shine a little more light on a confusing subject.
So: If you mean, "Should I order a Standard breed from a hatchery or a production breed from a hatchery," the answer is, since your main goal is eggs, get a production breed.
For a bird with a bit more meat on it in the end, and a few less eggs, go with a "heritage" or "standard" breed from the hatchery such as a barred rock.
If you want a true dual purpose bird, choose your breed and find a breeder.