There are those on this board who adhere to theory that double butted spokes are superior to straight gauge spokes because they are able to tolerate greater stress before breaking and triple butted spokes such as the Alpine III are even better yet. And this may be true but most people (unless you're a Clyde carrying an extreme load) can probably get satisfactory use out of 14g or 2.0mm spokes, assuming you have enough of them and the wheel is properly built and tuned.