I haven't heard that EE are excessively agressive or flighty. Many people have them and love them. They are certainly easier to come by so if the blue/green color is not an absolute goal, I'd say go for easy for your first flock (or mix them with some other breeds, get one of each of 3 different breeds).
There is absolutely no reason not to mix chicken breeds. I should know, I have 9 different breeds. As long as they are more or less the same size there should not be a problem. I would probably not mix bantams and large fowl.
There is absolutely no reason not to mix chicken breeds. I should know, I have 9 different breeds. As long as they are more or less the same size there should not be a problem. I would probably not mix bantams and large fowl.