We'll start with one of the most difficult categories to judge: Design. Both the iPhone and the Pre have elegant designs. Many users have fallen in love with the sleek and sexy look of the iPhone - even the original one with the brushed aluminum back. The Pre doesn't look cheap either, using a similar shiny black plastic for the case. The iPhone screen is larger, at 3.5 inches as compared to the Pre's 3.1 inch display. For some, the sliding design of the Pre is preferred for text messaging and email. This will be discussed in another section, but it's worth mentioning from a design perspective.
For the design category, iPhone wins because of its large, beautiful display.