Most film enthusiasts will point you towards the widescreen edition. This is the version that best preserves the filmmaker's original intent. You get to see the entire frame as it was envisioned; nothing gets cut out. Considering how visually dense a Star Wars movie is, scenes like the Geonosian arena, the Clone War ground battle or the Coruscant speeder chase are jam-packed with characters and action, so cropping the image invariably results in losing some intricately-designed detail. Easter egg-hunting viewers won't be able to find the X-wing and TIE fighters in the full screen Episode II DVD, for example; they were cropped out of frame in order to fit the more important action on the screen.