Why Mac OS is better than anything Microsoft has put out (yet)

When Vista came out it was more than double the size of Vista. The more complex the system, the more computing power and space needed to run it. More importantly, it increases the chance of bugs and slows it down. Apple knows this, like any decent software designer should. Thus, their latest version of their OS is half the size. Instead of completely redesigning their OS, they've worked on optimization which will lead to a much better, more stable product. Of course, they have the added advantage of starting with a superior product in the first place.