1 Generally, I choose the ebook first, sometimes complementing with the audio version. Notes and search are important functions. If I really like it I go for the physical book as well.

2. . For example, the podcast Crypto Voices has great content, but there is a lot of discussion around graphs and figures, which makes it rather hard to follow on audio, even if the host Matthew Mezinskis is fantastic. A picture is worth a thousand words