I have done a bunch of photo testing of Asbell wool for exactly the reason you are asking.
Plaids are fantastic. I have literally ALL of them, and use them depending on where I am going to hunt...Cedar Swamp in a pine tree, Hedgeapple Hideaway in the corn, etc.
But if Teresa came to me tomorrow and said "There is only going to be one pattern, or one color, choose now"....I would pick solid gray. It blends everywhere, all the time.
Winter deer are gray. Rabbits are gray. Wolves are gray. Coyotes are gray.
Hunt gray with EXTREME confidence.