The document compares the user experience differences between the iPhone and iPad. It discusses 5 key differences: 1) Screen size (iPhone has a smaller screen vs iPad's bigger screen), 2) Orientation (iPhone is portrait-oriented while iPad supports both portrait and landscape), 3) Familiarity of UI (iPhone UI is more familiar while iPad allows more creativity), 4) Private vs shared use (iPhone is private while iPad is more shared), and 5) Mobility (iPhone is very mobile while iPad is more of a hybrid hand/desk device). The document provides examples of how these differences should be considered when designing apps for each platform.