
For me, typing and reading are key uses, which makes anything smaller less appealing, since typing with one’s thumbs may be useful in certain circumstances, but if you’re writing a paper or article, I think the “inconvenience” of having to pull a device out of a backpack or briefcase rather than a coat pocket is more than counterbalanced by the convenience of a larger keyboard.
Here’s a review that focuses on features of interest to academics, such as reading and annotation of pdfs, or grading electronic assignments: