I use the Mars built-in reader for PDFs (it auto-crops, brightness & contrast) and KOReader for epubs because the built in reader is a bit rubbish for books.
The KOReader was downloaded from git (ARM apk) by the Mars browser and has been updated inside KOReader a few times. KOReader can also somewhat use the metadata file that Calibre puts on the Mars.
No problem with KOReader and Calibre, once I figured out Mars's MTP in Linux (you have to stop the file manager system automounting it).
KOReader has a little learning curve but is very good. Wasn't impressed with Moonreader on my Tablet, but I use Lithium (epubs) and Xodo (PDFs) on it. The KOReader is better suited for eink and I use it also on Kobo Elipsa for PDFs only (auto crop).
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