I do both/and. I don't think I have any actual preference for the act of reading, except for very thick books. (I would never have managed War and Peace without my Kobo.) I do prefer browsing and shopping for physical books - there's that lovely serendipity of finding something wonderful and unexpected in a charity shop or car boot sale or the library, which I've yet to replicate online. On the other hand, it's very convenient to be able to download vast quantities of Project Gutenberg/AO3 and take it on holiday with me.

A couple of times I have bought the ebook of something and followed it up with the physical edition - usually because there were maps or family trees or something else I wanted to be able to flick back to.

Audio books don't work for me. I find it very difficult to concentrate on more than one thing at once, and I can read much quicker than anyone can read to me.