Most people probably like the Kobo-software fine enough to not care. You don't need to add any app.
But Koreader is probably the best you can find if you use pdf-files. It also gives the possibility to have books in a folder structure, which for some is a huge win.
It is nice to have the possibility to fairly easy install other readers. Koreader, Coolreader (& games), Plato, etc.
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