I have Buff Orpingtons, recommended by a friend who raised chickens in the Depression era as the sweetest, best-laying hens around. That's true, they're wonderful. I also got a couple of Plymouth Barred Rocks, recommended by my feed store owner as being good foragers and good layers. That's also proven to be true. They lay a funny, big pointy egg, too. And then I got Americaunas for the children in the neighborhood (I give eggs to their parents), because they lay blue or green eggs.
Of these the Americaunas are the quietest, but more challenging than friendly. The Barred Rocks are fairly quiet, but get going on the clucking if disturbed by something (which can be people talking in the nextdoor back yard or an argument among the hens over a tidbit). The Buff Orpingtons are quiet except right after laying an egg, at which point they feel they have bragging rights, and they do that "bruck bruck bruck bruck, bruck-AHHHH" that you hear on cartoons.
I love 'em all, but if you want quiet, I think it's Americaunas you'd want. They were the last to start laying, at six months (the buffs went first, at four months, with the Barred Rocks trailing along at 5 months), but they lay regularly.