The goodereader side-by-side video comparison of the Aura & Paperwhite in the dark is a waste of time (
https://www.youtube.com/watch?v=7uyniTpucQ8). I only glanced through it because what is the point of setting both lights to roughly 50% brightness for comparison and then leaving it at that? They even mention in the video about using a low setting in a dark room, but they just ignore that and put them both on 50% for absolutely no good reason. What is so difficult about putting them both at the optimal level of brightness for the reader and then comparing them?
From the video all you can tell really is that the Kobo Aura looks brighter, that's for sure, and the screen does look nice and white with crisp fonts (but as booklover6 says, the font on the Paperwhite is a lot blacker in comparison - though the opposite seems true in the other video with no light?). It does make me wonder if the light on the Kobo is that bit too bright again?