too early to call either way. But from the demos posted here over the past year or so, eInk EPD panels win in direct sunlight over PixelQi panels in color reflective mode but the gap is closer when the PixelQi panel is in what amounts to monochrome reflective mode (for lack of a better remembrance of their terminology).
There are no standard LED/LCD panels which beat PixelQi in direct sunlight or even in shadows, though the iPad might be close. Again not enough real world use of the PixelQi panels just yet.
But even Mary Lou Jepsen stated during an interview with Charbax that the Kindle, basically referring to Eink EPD panels in general, were higher contrast in direct sunlight but that the PixelQi, shown in the videos side by side was sufficiently close to be reasonable. But then as you move into shade or darker environs the EPD panels become less and less versatile handing the overall advantage to PixelQi if using your device in a wide range of lighting conditions is your goal.
As for the Entourage Edge. Remember it is a Gen1 device and will get better or worse, only time will tell. Much will depend on how Android grows as well as how able the Edge folks are at adding functionality to their device. I would love to see an Edge using a PixelQi as well as EPD panel or eventually dual color EPD panels though there is the issue of lighting again.
We need radon particles in these panels to "solve" the problem...right? Radiation makes everything better because it makes things glow in the dark....then again the "eye strain" might be an issue.