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KOreader has no impact on the stock readers, so you loose nothing trying it out.
I don't know how much of, and what features of, The Adobe Reader Mobile Kobo has implemented as its epub reader. They also have their kepub reader program (not sure what that may be based upon). I haven't used the Kobo readers, in the last 5 years or so. I am still on FW 3.5.0 and haven't used the readers included in that. So, I can't speak to how Kobo's readers perform.
The KOreader makes use of several reader engines, (none of them the Adobe Reader Mobile one) but is built largely from scratch using mostly scripting languages. This makes it highly adaptable and transparent, from a programming point of view. For .epub the Coolreader 3 Engine (cr3) engine is used and has been updated a few times since Koreader was initially released. PDFs are handled by MuPDF engines with a number of updates, as I understand it.
I find the .epub rendering in KOreader at least the equal of the Adobe Reader Mobile stock reader software. I also find that KOreader allows for more fine tuning within the reader.
Luck;
Ken
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