Regarding PDFs FWIW ...
I tried using KOReader briefly a few years ago. It was definitely a more versatile PDF reading app than the Kobo stock app.
However, once I got a Forma, which allowed easy 90-deg rotation to Landscape mode, I found my (few) PDFs (novels rather than magazines or comics) surprisingly easy to read in landcape because the page buttons handle both the turning from one PDF page to the next and the moving down a single PDF page in screen-size "chunks". Even a (fairly poor) scanned image PDF was readable. Of course the buttons are then along the bottom rather than the sides, so not quite as comfortable.
A LibraH2O may not be quite as good because it's a smaller screen but landscape may still be perfectly acceptable for PDFs displaying mainly text.
|