I have an older Kindle, and 2 Kobo's. I've never tried a Nook (can't recall ever seeing one in a store up here in Canada but the Kobo's can be found in lots of stores) so I can't tell if it's better or not. I don't tend to judge by features only, I like trying them out.
A big selling point with me is there needs to be a button to turn the page and it has to be comfortable to hold with 1 hand while turning pages, something you can't really do with touch gestures to turn pages.
Basically when I'm asking is, what does Nook bring to the table that the others do not?