Last year Apple embraced the mantra that "bigger is better" for the iPhone. Now it's done the same with the iPad line, in the form of a larger-screen 12.9-inch tablet. But Apple isn't the first to make a big tablet, and not even the first to call it "Pro." How does the iPad Pro compare to other large tablets, like the Galaxy Note Pro 12.2 and the Surface Pro 3? We've lined up the specs side by side so you can decide which one you'd rather hold in your lap while you work.