Size matters
In my opinion size is currently the deciding factor. Kobo currently have stopped selling a 300dpi 6"model, so for 6" you go Kindle, for bigger you go Kobo.
I stopped using my H2O because I found that for reading sessions of 30mins plus it became uncomfortable to hold. The KA1 is bigger still. (If you could find someone still selling the Glo HD, then that would be my choice).
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