A mix for me, too. I love the convenience of digital, it's really good to just be able to flick from one game to another. But digital pricing doesn't take into account that you can't trade when you're done with a game. There's little point in me paying the same price for digital, when I can buy a disk and then get something for it once I'm done.
I've bought digital versions of Tomb Raider and Trials Fusion. Tomb Raider I bought for £22.49 when the sale was on, was happy to forgo any physical trade value at that price. Trials Fusion is a game that I'll want to keep for a long time, so I was happy to go digital with that. I really want to go all digital, but at the moment it just doesn't make financial sense to me.