I have some opportunities to read English textbooks recently. Different from Japanese ones, lots of academic books written in English are available via Kindle, Scribd, and other e-book readers.
So, you are free to choose. Actually, Kindle, iPad and other tablets, and paper books have each advantage.
E-paper equipped in Kindle and Kobo looks similar to paper. It never shines itself, resulting that you are unlikely to get fatigued after reading for a long time. However, e-ink takes a second to alter the content. It is not preferable to riffling. As a result, e-paper fits careful reading. When you want to read through the book from top to tail in detail with a certain time, Kindle is suitable.
Tablets equip several applications to read e-books. Adobe Reader is a representative. It looks like a real book. With OCR, you can search any words in a PDF file. Riffling speed depends on the spec of the tablet, faster than Kindle, but inferior to paper. You should be cautious that bright light of the tablets are harmful to your eyes.
I need not explain paper books. You are accustomed to reading a paper book. Paper books are the most suitable to look at a glance with riffling. You can write in the book, as well as folding the corner of the page, even tearing superfluous pages. At last, they can be a substitute of toilet paper in an emergency.
How about vulnerability? Paper books are weak to water, dust, and sunlight. Instead, you should remember that some e-book services have terminated with no more usability of the contents you had purchased.