There is definitely a different flavor from black and white peppers. I used to use black instead, when white was called for (used to be those dishes where they were worried about the black specks), mainly because I really did not like the flavor of white pepper, which always seemed to have sort of a musty flavor, even when freshly ground. It wasn't until many years ago, when I got a paper catalog from Penzey's spices, and I saw they sold those
Sarawak White Peppercorns - a little more expensive, but they explained why, which also explained why I never liked those white peppercorns. They said that the usual way of making them was letting the peppercorns totally ripen (the black ones are unripened), then soaked, for a generous time, to soften and remove the hard, outer shell (which is the wrinkly, hard shell of black peppercorns), and the time they are left in the water is when they get that "off flavor" that some people don't like. However, Sarawak Peppercorns are made by softening the shell in running water, which washes away that off flavor, as it is softening. They are much lighter in color, and have a much better flavor than regular white peppercorns. I remember one of my earlier Thai cookbooks, in which the author called for black pepper in the recipe, stating that he knew white was traditional, but he just didn't like it! I read that after I had discovered the Sarawak, but before, I always used the black, too. Now, I have a peppermill for white, Szechwan, and I think 4 more for the black, so black is still my favorite.