You are of course right matey. IMO the landscape also plays a factor, although a really good dog will be able to handle most things, certain sizes and other attributes such as acceleration and stamina, will help a dog fair better against all quarry in different types of land. Obviously i everyone would prefer a dog that has it all, but even these come in different packages. Then there is also the factor of the hunter, some dogs suite some peoples ways of hunting and mentality better than others. I'd take an all rounder collie x over an all rounder bull x, but thats me.