And then there were three: with the introduction of the Surface Book, Microsoft has joined Apple and Google in offering a premium laptop that runs its own platform. But how does it stack up next to its rivals, the 13-inch MacBook Pro and the Chromebook Pixel? We've put the specs of each side by side to help you sort things out. As you'll soon see, the three only share a few things in common. They reflect the unique philosophies of their creators, whether it's Microsoft's fondness for tablets, Apple's preference for powerful (if conventional) laptops or Google's desire for lean-and-mean web machines.