Flac for me all the way.
I used to be a massive fan of vinyl & still am, but in practical storage terms & in terms of financial savings, digital wins all the way, especially when I play out. I don't mean by that, that I leech everything for free off the web, if I like a track/EP, I'll buy it online
I also think that digital offers all sorts of exciting potential in terms of audio manipulation, the whole idea of looping a section of a track. Something unavailable through vinyl, unless you are a turntablist or have some locked grooves etc. Or of course, you can just play tracks all the way through.
Every now and then, I have the laptop playing & will mix vinyl into it, just to scratch the old itch.
I suppose a good dj will shine through regardless of medium & I think it's very naive & prejudiced to dismiss a dj for sticking to one or the other. I still hear both great & really dull stuff via both media.
I can sort of see the logic in saying specific genres deserve vinyl only djs, (eg. Northern Soul ableton set just sounds daft), but given that house is based on loops, dunno if I would argue that old house stuff etc should be vinyl only.
I really can't make my mind up on that point.