I have some Kobos and Pocketbooks. A major limitation on both of them is that they do not search by filename. They search by metadata title and author name, but when you download random files on the internet, the metadata may be messed up and then it would be more useful to search by filename.
If you do not want to use Calibre to fix metadata and to organise your ebook library (I do not), then it is necessary to keep the files organised by filenames and folders, and you need an ereader where you can install Koreader app to sort and browse and search by filenames, or install a file manager to sort and browse and search by filenames.
Koreader can be installed on Kobo and Pocketbook e-readers, and also on some select jailbroken Kindles. Android e-readers (Onyx, Boyue, and some others) should be able to allow installing some sane file managers, if they don't already come with one.
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