For myself, the Kobo Glo has the front lit screen, which I really wanted. And the common factors are that Kobo reads epubs like the Sonys; and the Glo (and I believe all models except the newest 6" Aura) also use infrared for the touch screen like the Sonys. The newest 6" Aura uses capacitive touch, which is also on the Kindles (not sure what Nook has been using, pretty sure IR though), but capacitive screens never play nice with my skin so I avoid those when possible (you should see me trying to press an elevator button that uses it in certain weather... but I am stuck with it on my phone). I also hate the idea of requiring special gloves if I want to read in colder weather with a capacitive screen as well.
Nook had the lowest resolution screen of them all at the time I bought mine, not sure if the newest Nook Glows are still behind the rest in that regard, but I think so.
So that's why Kobo was the best option for me. And I was able to find a local store that stocked them in case I hated it, it would be an easy return.
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