Yankees and Red Sox. Edison and Tesla. Dell and HP. Both American PC titans have release shiny new ultrabooks this year, hoping to find a small place in your carry-on bag. The Dell XPS 13 Ultrabook is a few weeks newer, but not so much newer that the HP Folio 13 is out of the running: both are slim, stylish notebooks with 13-inch screens, Intel Core processors, SSD drives and the latest version of Windows. So which between the two of them should get your hard-earned dollar? Let's break it down.