Welcome to Yorkie Talk. The traits you listed are generalizations. Not every Yorkie fits the same mold.
My boys are very affectionate and attentive, but I often think they are that way because we have encouraged it. Also, Max and Teddy know that being charming will bring more outings and walks, and all of their other favorite things.
Some people claim that one gender is easier to potty train than the other. I had no problems with the boys.
Some pros for Yorkie boys: boy puppies tend to be easier to find and are usually priced less than girls.