I'm considering whether it's better to go for the new iPhone 4 or the iPad. The retina display on the iPhone 4 makes text crisp and readable even at small fonts so I wonder if perhaps Logos 4 on the iPhone 4 is adequate or maybe even better than on the iPad. It's certainly cheaper to get a 2 year contract data-plan and have an iPhone 4 that does many things rather than iPad that's limited. But I would like to hear the experience of those who own these devices.