I have Kindles and Kobos. I don't have a Nook or Sony ereader so I can't compare them. I do have a Nook HD and HD+ that I use for videos and games. I think their interfaces are pretty clumsy but they work and they're decent tablets overall. I have no idea if the Nook ereader is as clumsy.
Comparing Kindles and Kobos there are features in each that I like, although overall I prefer the Kindle interface. I particularly liked it's X-Ray feature at first but they updated it and made it clumsy. Since they did that I've pretty much replaced it with search.
Someone mentioned global search in the Kindle and I can't say that bothers me a lot but it does mean an extra tap to search the book, which is the only searching I can recall doing. Search seems to work more smoothly and give me better information on the Kindle, though.
I use bookmarks on the Kobo a lot more than on the Kindle. That's another feature Kindle ruined by making it more powerful/clumsy. I used to be able to tap and there was a bookmark. Tap again and it was gone. No distraction. Nothing to think about. I can still do that on Kobo but on the Kindle I have to remember each time what to do next.
Getting into and out of a book is trivial on the Kindle. It's always right there on top. I keep cover mode turned off and I just tap the title. On the Kobo I have to try to interpret the various cover images. I usually find it easier to put it into book mode where the covers go away but that's an extra step.
The really important stuff is simply reading the book. All the rest is nit-picking, which I'm happy to do but I know it doesn't really matter much. Reading a book on either device, my eyes scanning the words, is the same. I prefer the Kindle screen but the Kobo screens are just fine. Of course I have new model Kindles and older model Kobos so that isn't a completely fair comparison.
I prefer the Kindle interface and I do most of my reading on the Kindle. If I didn't have a Kindle I'd be perfectly happy with my Kobo. What I really, really want though, is an e-ink ereader with an interface like Moon+ reader so I can gracefully scroll through my books.
Barry
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