I have a Nook Glowlight Plus and while there are a lot of good things to say about it it has one very serious showstopper problem and another rather unpleasant problem. I don't use mine much.
The big problem is that N button which is no longer a button but is now a capacative spot below the screen. If you touch it off you go to the home page. And it's located in exactly the hardest place to avoid touching while you read. I rarely get through a whole page without finding myself back at home suddenly. It's terribly irritating! It makes me want to string up whoever designed that tragedy!
The irritating problem is that someone had the bright idea of making the dictionary popup have a pale shade of gray against a white background, very difficult to read. This is a much dumber flaw than the N button but it matters a lot less.
Other than that it's a really nice device. If those problems went away it might be the nicest of them all.
I also have a Kobo Glo and a Kobo Aura. The Glo is not the HD, but the older model that does have a micro SD card slot. I never used that slot but it's there if I ever wanted to.
The Glo is also a very nice device with an excellent screen and no serious showstopper problems at all. From what I've read the Glo HD is even nicer although it doesn't have external storage. That wouldn't matter to me at all. Kobo's tend to be a bit buggy. They have a lot of nice features and most of them work some of the time. A few even work all the time. None of the bugs are problems but sometimes they can be mildly irritating. Still, even with that it's a very nice device. If it was my only ereader I would be fine with it.
I also have all 3 Paperwhites and a Voyage. No external storage but very nice devices. The downside as you said is mobi only but even though the Kobo can read Mobi most of it's features don't work well with it and you'll find yourself converting to epub. With the Kindle you have to have Mobi or one of Amazon's more advanced formats so you have to convert a lot but Calibre makes that trivial.
I do most of my reading on my Voyage but I use the Paperwhite a lot too and the difference in them is small enough that I sometimes wonder why I got the Voyage.
The Kindles are very stable. Everything works as you expect it to. There aren't nearly as many features as the Kobo but the important features are there and they work well.
My preference is for Kindles but Kobos are also good and I suspect you'll be happy with whichever of them you choose. You might not be happy with the Glowlight Plus unless you can keep your finger off that *&%&&%*+@ button. I can't.
Barry
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