Computing is in the midst of a transformation that puts your future device purchases up for grabs. It’s a safe bet that everyone will have a phone, and as the last holdouts switch over, that will inevitably mean a smartphone. But when your PC finally gives up the ghost, are you going to buy another PC? Perhaps a tablet? Or will another large screen device –a really big phone - be the ticket? Maybe just get all three? Benedict Evans and Steven Sinofsky discuss why laptops and tablets are competing for the same customers, and why it’s never wise to defend any form-factor to the death.