Mostly Digital. All dem torrents and scanlations and stuff, since most of the titles I read or watch aren't officially translated (yet).
I do buy raws on some occasions of my favorite series. Some I have bought from my friend who goes to Japan for Comiket, who buys from the bookstores in Akihabara.
How convenient for you. I'd like some raws to the ones I read online. Sadly, I live in America, so I'm stuck with VIZ, Tokyopop, YenPress, etc. I could only get some popular series like Pretty face, Soul Eater,and Bakuman.
If I find ones that I like. For example I loved the Ghost Hunt series. I went and bought the dvd box set and all the manga in a single day. I've done that a few times. Mostly I like having the physical copies on me just in case my computer goes bye bye.