Those two Terms of comparison are interconnected, as I believe that on audiobooks generally you will be able to finish the books quicker, as it requires less concentration, but on the other hand it is easier to miss something, because as the books finish faster, you get a bit less emotionally attached to it, and therefor apply it less. But those are general assumptions and it mostly depends on the reader of course, that is just my experience. You may also stop the book of course or rewind when needed, or take notes as you read to retain information better.