I have two breeds. I picked the Black Australorps because they met my criteria:
- color that does not draw the eye of people
- standard feathering (no: silky, frizzle, tophat, muffs, beards, legs, naked neck, etc)
- Moderate or smaller comb (to tolerate a three-sided coop in a cold climate)
- Neither super producer of eggs nor seasonal egg layer
- Lays medium or larger eggs (so no banties)
- Best chance of being as quiet as possible - both vocally and tolerating confinement.
My first choice was Black Java but I found only one place that offered them and they had minimum order of 25 and did not allow picking them up. The cost of the extra chicks and shipping was about a hundred dollars. So I went with my second choice.
I picked the Brown Leghorns because I thought I might enjoy the flightier personality more but did not want to get only leghorns in case they (or their combs) did not do well in the open air coop or do well with the confinement of my smaller-than-I-would-like set up.
Advantages. The difference in temperament was good for both when they were very young. The leghorn chicks were crazy active and reactive compared to the australorps. They immediately found the food and the water, explored the wool hen, and so on... I'm sure the australorps ate and drank sooner because of that. On the other hand, the australorps were calm enough to temper the leghorns reactiveness... staying to eat and drink longer or returning to it sooner when it was replaced. That sort of thing.
I have half a mind that the differences are a disadvantage now that they are over a year old.
For what it is worth, no combs on either breed were damaged through the winter. The confinement is pretty hard on Spice but not Nutmeg (the two leghorns I kept). And I found I enjoy both types of personalities.
Eleven calm to three excitable was a good ratio for me as a newbie to chickens who came with a lot of caregiving experience.
Next time, if I live in the same place, I will get all Black Australorps unless Black Java become more available. If I move to a much warmer climate and have more space for a run then I may get all Black Leghorns.