I keep forgetting recent events more and more....(please let it be my current medical issues) and at work I both electronically file and paper file. It used to be fine but now I have so many overlapping categories (should a blank form about threatened and endangered species go into into my form folder or my report folder, or my natural resource folder (sometimes I stash copies in all possible folders). Sometimes the important (and long) stuff absolutely needs to printed out and put into a special to do tray. Especially items with long directions, I do find it easier to scatter/scan and basically pick out what I need in paper form. The rest gets shredded and recycled or cut up to use as scratch sheets (memory going, got to keep constant notes.
Partly I think that I work both electronically and by paper because I am Gen-X (a really old Gen-X, they used to call us "Baby Busters"). The first time I dealt with computers was in a lab as a senior in High School learning basic on an Apple 2e. So with me it just depends.
However my experience might not be very applicable. When I e-read its usually for entertainment either fiction or non-fiction informative stuff having nothing to do with with work. The e-reader is a convenience and great on the road, however unlike many on here, I don't build e-libraries or even really try to save the files forever. So I am a luddite compared to many on here.
I guess in the end I am neutral, the answer depends on what your remembering, why, and how your have developed study habits and such over time.
However I can say with certainty that taking Ambien and reading (any format) don't work....black hole next day. I have had to go back and read entire chapters after reading after Ambien. So now I put all materials away if I have to take that stuff. Yes a bit OT but its still memory and reading