Colour has nothing to do with the working ability of a dog.
That would be like saying a red car would always be faster than a black car.
Think their was a stigma attached to white dogs back in the day when a lot of poaching was done because they where so easier to see. Saying that any time ive had or seen a white dog out lamping they have been good grafters.
An they've been just as hard to see as any other colour of dog unless they are ryt beside you. atb