It's the battle of the tablets. Just as Apple unveiled the ultrathin iPad Air with Retina Display, Microsoft officially released the Surface Pro 2. Although both are excellent tablets for small businesses, each device has its own set of capabilities. Whereas the iPad Air is strictly an iOS tablet in form and function, the Surface Pro 2 is a versatile, Windows-powered hybrid machine that can be used as a tablet, laptop or desktop computer. To help you choose which tablet is right for your business, we've compared the iPad Air and the Surface Pro 2.