From my experience in the fall to winter the blacks move a little deeper and spread out more to isolated cover where as the whites tend to bunch up more on mid depth range brush, example would be the other day I caught 15 fish limit off one brush pile on a ledge from 12-23 ft deep all whites with one black that came off the bottom on the 23 ft side next day fished isolated cribs and brush in 23-27 ft water and the catch rate was 50-50 black and white,