At that time I enjoyed my X220. To be sincere, the form-factor and practicality moving from home to work and having the dock. Then the XPS 13 was more perfect for me because I could attach three external monitors and have power just via a single Thunderbolt cable (no more custom docks). The crux for all of these was the battery daily duration and replacement after a few years. In that context the MacBook Airs excel at a point that more expensive and powerful Apple notebooks such as the MacBook Pro cannot sustain a "marathon" without a charger. The issue with the Airs is that you cannot currently connect three external monitors (without doing very hacky things), but this is just a question of time. Also, this obsession from Apple about not having touch screens in notebooks because they also sell iPads is disturbing.
Finally, an XPS 13 with good battery support (assuming ARM) and good Linux power handling will, probably, be the best notebook available. (would love if they remove the XPS 13 fan and there are more non-moving part notebooks)
Finally, an XPS 13 with good battery support (assuming ARM) and good Linux power handling will, probably, be the best notebook available. (would love if they remove the XPS 13 fan and there are more non-moving part notebooks)