I am looking into getting a DA-AK and an AK20 to run with my AK40. My question is when would I choose to run this set up vs. the AK40 pair like I usually do?
BWolf and anhisr can comment specifically on the neumann setup and it's "flavor" (for lack of a better term), so I can only offer what I know as a result of running MS with my own stuff.
I find that if I'm uber-far back, or I'm in the sweet spot, then MS works better for me, while if I'm 1.5-2 times the distance to the stage as the sweet spot is (so if the spot's around 50' and I'm around 80 or so), then I
prefer running standard cards because of what how the recording angle to the stacks, the response off axis of cards, and how MS changes your "pattern" at the same time as your angle.