It's made from a different strain of wheat and is lighter than traditional whole-wheat. Its flavor is also milder, making it taste more like the refined flour many of us are used to. But here's the kicker: It has basically the same nutritional value as whole-wheat flour.
Subbing white whole-wheat flour for an equal amount of all-purpose results in a denser biscuit. In our favorite CL recipe, Fluffy Buttermilk Drop Biscuits, which calls for 2 cups flour, we use 1¼ cups all-purpose and ¾ cup white whole-wheat.