I don't have Schoeps or DPA, just CA-14. And with all the pro-cardioid sentiment here, from people much more experienced than I am, I have been trying to experiment and understand how cardioids can do the job.
I understand that cards focus on the sound from the stage/stacks and rule out the ambient distractions.
But...omni is for me. First, as all have said, cards are much more susceptible to wind noise.
But beyond that, the folks in front are just as likely to be chatting as the folks in back.
And ears are omni.
Most of all I get this odd, holodeck feeling from card playback in headphones, like there is nothing--I mean nothingness, the void--behind me. It's just a weird, unnatural sensation. Not like the concert I was at.
I like omnis. I have regretted them when I am stuck next to chatterboxes, but not that often. And yes, FOB is the sweet spot unless the place is really eccentric.