Of course the Retina iPad mini is easily the most portable in this bunch. It's 27 percent shorter, 22 percent narrower, and 16 percent thinner than the Surface 2. It's also 51 percent lighter. The iPad mini can make for a pretty cramped faux laptop (it's more like a faux netbook), but, once I got used to it, I actually don't mind using its tighter keyboard layout. In fact, I actually typed this entire comparison on a Retina iPad mini with keyboard cover. Your mileage, of course, may vary – and I definitely wouldn't recommend it if you have arthritis or unusually large hands.
KeyFolio Pro 2 offers compact and attractive design which doesn’t add much bulk to your iDevice. The polyurethane fabric cover has leather like look and feel and your iPad with keyboard seems very secure in it when closed.