I can certainly chime in on this one....
Being a middle school band director for several years, I have run both the split omnis on stage and ORTF cards just off stage, both yielded good results. Ideally, spaced omnis on stage AND cards from ~halfway back in the performance hall.
I now teach high school band. We have a guy that tapes for us. For our first concert this year (last week) he ran AKG 414s (Cards), ORTF from about 10 feet above the director's head (DFC) pointed slightly down, aimed at the middle (front to back) of the ensemble. Very nice results.