The tapered pins are great for rolling softer doughs, as are the French pins. I like the wooden ones with handles for larger amounts, or firmer doughs. The marble pins are sort of a gimmick, for people who think it'll make a difference with colder doughs. But if you work at a reasonable speed, it shouldn't make a difference. Metal pins (non-stick) are also a waste of money. Flour and/or paper is all you need to keep dough from sticking.