So different, yet so alike. The Microsoft Surface Pro 2 and Lenovo ThinkPad Yoga are Windows 8.1 Intel Haswell Core machines with smaller than average form factors and an active Wacom digitizer. The Wacom pen is standard on the Surface Pro 2 and optional on the ThinkPad Yoga. Both run clean software builds with little (Yoga) to no (Surface Pro 2) bloat and are fast. The big differences? Size and form factor. The Surface Pro 2 is a 10.6" tablet and the ThinkPad Yoga is a 12.5" Ultrabook. But both have the power of an Ultrabook and run on the same Intel Core i5-4200U CPU with 4 or 8 gigs of RAM and Intel HD 4400 graphics. Both are available with manufacturer brand docks to make desktop use easy. So how do you choose? Read and watch our comparison to help you decide.