CDs.
Never, ever stream or download.
I want to see artwork, lyrics and sometime freebies, DVDs etc. I just don't see how one can connect with a download.
You also don't 'own' the download wither. I want so support bands especially those that put in some effort to a good release be it cool packaging or whatever.
The Anthrax singes of old were great - lots of random tunes as extras! Even as recently as the 'Fight 'em..' 7" releases!
For Anthrax - every physical format.