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I've owned: Delawares, RIRs, Buff Orpingtons, Plymouth Rocks (Barred and Columbian), EEs, New Hampshires, Australorps, OEGs and a variety of crosses and bantam breeds over the course of 20 years.
What breed would I choose? Delawares. Why? In my experience, the only breed on the list above that lays better is the RIRs, and Delawares generally (although not always) have better temperaments.
But I noticed you listed temperament first, and if temperament is your primary consideration, you should probably go with the Orps. Hands down, they are the nicest birds overall. Rocks are often nice too, but in my experience, they vary widely based on strain.