Wolf
It is my opinion, due to the fact that I find that e-reading is slow and my absorption in the material as well as my retention is much better with printed works. Learning gemara requires getting “into it” and poring over the volume. I think if you do an experiment you will find that your experience with a book will be much better (and I think more fulfilling) than digital reading.
I also read a bit about this. Time has a good article worth reading. Google “Do E-Books Make It Harder to Remember What You Just Read?”