If you are busy worrying about whether or not the DJ is playing vinyl, CD, Ableton, or an Unplugged MPC, then you fail to grasp the major component here...
IF YOU ARE FUCKING DANCING, YOU SHOULDN'T EVEN SEE THE DJ. What makes coverbands so special anyway?
If you're not playing all your own production, stfu about the format. 3 pages of waste drivel I shit you not. I nominate this thread for dumbest pile of shit on the internet. Oh, look at me, I'm playing someone elses music on CD... oh look at me, I'm playing someone elses music on vinyl...
it's still some other persons music. You didn't produce it? Then who fucking cares what you think about the format. Buy it or don't. I think the vast majority of people who prefer digital only also prefer to steal their music. And it's not the fact that they play digital only that leads me entirely to that conclusion, so much as the fact that 80% of people steal all of their music. Every track of it. You can't download records. I am 1000% more supportive when I hear a tune from my label in an all vinyl mix. I know for a fact they didn't rob me. 80% of the time that guy with the laptop did.
In terms of actual ability to get shit done, whatever works for you works for you. Sell both formats or you'll be cutting out a large group either way. Most importantly though is to just STFU.
If you play any format, why don't you stop talking and start playing.