In the future, putting SPOILER and some space as a warning would allow those of us who are still listening to avoid seeing the answer by not scrolling down. Especially with summer activities, etc, delaying listening.
On this material, it was a close comp, close enough that I wanted to do more listening (I only have headphones and a laptop with me), and isolate more small samples. I was preferring A in blind tests, for generally sounding more musical. Picking out actual reasons, source A seemed a bit more full (especially on the bottom), and the cymbals seemed to have better detail and more air around them, especially the decay. The would be most interesting to hear on cymbals that aren't going through a PA.
Maybe the v3 comp folks are thinking of is where the a/d of the v3 is sent to a digital in, and the analog outs to the m10.