If you want to read PDF's I'd suggest a tablet or at least a very large ereader, one with at least a 10" screen. PDF's don't flow so they're not good on a normal size ereader. That said, they work a little better on Kindles than on most others.
Leaving PDF out of the equation Kobo has a feature that lets you turn off the touch screen except to turn pages. Kindles also have that feature but it's a little clumsier.
Since you want a larger screen you might consider a Kobo Forma or a Kindle Oasis. They both have page turn buttons.
Barnes and Noble's Nook is a nice ereader and their current model has a larger screen. It's firmware is pretty buggy but I like mine a lot. None of the bugs interfere with anything I do. They also have page turn buttons. They don't allow you to turn off the touch screen. Also if you decide to return it you'll find Barnes and Noble difficult to deal with. They're not known for their customer service.
I've found Kobo to be easy to deal with and Amazon the easiest to deal with.
I would definitely avoid GoodEreader. They've ripped off a lot of people. B&N's service isn't good but they're not dishonest. I wouldn't say that about GoodEReader.
These days I read mostly on my phone but I have and have used a lot of ereaders and I've always preferred Kindles but I've had enjoyed my Nooks and Kobos too. They're all excellent devices. It's just a matter of what fits your personal preferences.
Barry
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