I have the original Kobo Aura. I was reading with it today. I used to have a Kobo Glo as well but I gave it to a friend who needed something to read with. I have to agree that the Glo has the better screen, by quite a lot, but the Aura screen is good and it's smaller and more convenient and I like the lack of a raised bezel so that's the one I kept.
I also have a Kindle Voyage with a much better screen than either of those and it's what I do most of my reading with. If I could only have one it would be the Voyage. But if I could only have the Aura I wouldn't mind that. It's an excellent ereader.
JSWolf it's true I've never tried a 6.8" ereader but I have used a 5" ereader. I sold it because I want a lighted screen but if I could have a lighted screen on that Kobo Mini it would probably be my main reading device. I like my Voyage but the screen could be a bit smaller.
Barry