Get the physical copies. After reading it, you could use it to flex or to fill up a bookshelf.

Exactly ^

The first time I read The Rise of Kyoshi I listened to the audiobook. I then proceeded to read The Shadow of Kyoshi on ebook. I eventually was gifted the box set (the one that has the extra annotated scene) and since then I’ve read them physically.

I think reading physically is the best way. The audiobook is really solid though (I now know how to pronounce the names correctly).