I've had quite a few Buff Orpingtons, and I think they are one of the prettiest breeds of chickens, but Wyandottes are better layers. At least, the Buff and Golden-laced Wyandottes I have are better layers than the BO's I've had before.
Did you ever get a decent answer to your question? I'd like to know the answer too. What did you end up getting? I'm leaning toward Wyandottes. I figure there's probably a better variety of pure breeding stock for them here in the US. But I'm just trying to learn. Any help from you would be appreciated. Thanks!