First of all, Booxtor (who works with the eReader Store in Germany) and his staff continue to work on a 4.4 upgrade for the K-Pro. The last beta they sent me for testing was much better. WiFi and Bluetooth both worked. The display did have a lot of ghosting when turning a page or changing a screen, so I needed to set it to refresh on every page. It's close, but not quite there yet.
Onyx does have some devices coming out that run Android 6.0. However, they are larger (10.3 and 13.3 inch) and much more expensive than the K-Pro would be. I haven't seen any mention of a smaller (6 or 7 inch) device coming any time soon that would run anything beyond 4.0.4, 4.2.2, or 4.4. Give me a K-Pro (or something like it) that runs Android 6.0 or higher, and I'll buy it now!
The Onyx app Neo Reader does a good job handling reflow text on pdfs. However, not every pdf is capable of reflow mode. I use my iPad for pdfs, to be honest. My eInk devices are simply too small. I haven't tried pdfs on the Nook.
The Nook Glowlight 3 has the same resolution (300dpi) as the K-Pro. The display is the same size (6 inches). Both have page turn buttons. I'm not bothered by the absence of a microsd card slot on the Nook, as I don't see the point on that device. The Nook feels lighter than the K-Pro.
The best thing about the Nook is the adjustable light feature in the display. You can make the light as warm or cold as you want. It does help for long reading sessions. You can sideload apps, and Calibre works well with it.
The K-Pro is quicker than the Nook (given its specs, you'd expect that). The K-Pro has more RAM (1 gb vs 512 mb for the Nook), internal storage (16 gb, with 12 gb available) while the Nook, since the upgrade, has one partition of 8 gb, with about 6 gb available to the user. I have tried Calibre Companion and Instapaper on the Nook, and both work fine. If you root the Nook, you can remap the buttons to work with a third party app (like AlReader). Otherwise, the buttons only work with the stock Nook reader. With the K-Pro, the buttons already work with AlReader and several similar apps. All in all, the Nook can handle some apps reasonably well, but the hardware isn't as good as the K-Pro. I suspect that the Nook's more limited hardware might mean that some apps wouldn't run on it even if they were compatible with 4.4.
The Nook is less expensive. If you don't mind fiddling with it a little, it might serve your needs. Otherwise, I'd suggest the K-Pro or the Boyue T63 or T65. The Boyues all run Android 4.2.2. The K-Pro and the Boyue can be found on Banggood. I've had good experiences dealing with them. No complaints.
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