I think reading may activate our brains more than just hearing, causing a bit better retention of the information.
Although adding music to what you hear bedevils you with songs that you listened to 60-70 years ago!
But overviews and the "big picture" seem more easily digested, understood, and retained via hearing.
On top of that there may be differences from person to person.
And then there is the issue of practice. The more I read via audio, the better I get at retention and understanding.
You mention music. I would add that when you listen to a book, you notice whether or not the writing has a lyrical quality to it. Acts 7 is a perfect example. This is where Luke tells of Stephen's recounting of Jewish history from Abraham to Jesus. When I read it, it is just like all other Biblical chapters. But when I listen to it, it is musical in its beauty.
I have listened to it many times now and it is like poetry.
Bottom line: I recommend both forms of reading because they each offer something different.
Even better, do both at the same time.;-)