Although I have been tying for several years, I consider myself a novice from the lack of knowledge I have fail to acquire. I see Snowshoe Rabbit Foot Fur, CDC and deer hair all used for wings on dry flies and emerger patterns. I have always taken it they were used because of a resistance to absorbing water and their natural buoyancy. I have CDC and deer hair in my materials, what are the advantages of one over the others?