We focus on Ultrabooks here but also keep a close track on what’s happening in the ultra mobile PC space through our work with UMPCPortal. For some people it’s more important to be mobile with all-day, all-scenario capability at the expense of processing power or speed. For others, the most important thing is to be able to carry desktop power and that’s where a Core-based Utrabook comes in. But how big is the difference in platform performance? I’ve had a Atom-Clovertrail based tablet convertible for a few weeks now and so I took the chance to test it alongside an Ultrabook convertible – the Lenovo Thinkpad Twist. Both devices have strengths, and weaknesses.