Pocketbook ereaders handle all formats tolerably. For pdf, there is even pinch zoom (not smooth at all, but it's there) and extremely useful per-column view.
But if you live in US, Pocketbook is nearly unobtainable.
Onyx ereaders are Android, which makes them personalisable, but also convoluted for people who never want to install apps, check options and tweak settings.
On Kobo, I personally use alternate programs and I never go into the default environment (except to be reminded why I never go there), but at least Kobo opens most of the formats one might need, epub, mobi, pdf, and some images. And it's a simple interface.
Do you have your own e-library for mom to read or will you start buying books after acquiring the device? If the latter, I think a Kindle Paperwhite would be the most obvious option in US.
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