Workability. 416 is moderately harder to drill than brass and the same with getting all the scratches out. 304 will make you cuss. It's very gummy, leaves a "hat" where the drill finishes the hole, sometimes has hard spots that will make a smaller drill press squeal. It finishes out to basically the same color as the 416. I use it exclusively due to it's greater scratch resistance - but it's debatable just how much more durable it is. I for one like it and no longer use 416 unless requested, but to each their own. It is less expensive but I guarantee the worn and broken bits and additional time to finish it mitigates any cost savings.