Retina display! 8-megapixel camera! Video calls! HDMI port! The last few days have seen lots of shouting from proponents of the hot phones of the minute, the Apple iPhone 4s and the Motorola Droid X. Which phone really delivers the best experience? We got our hands on both and tested them in seven categories: cost of ownership, storage, connection speeds, still and video image capture, display and resolution, operating system, and multitasking and media playback.