Can't answer your question, but why are you going with the passive ATC. They love power and show a distinct preference for tri-amplification.
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Since only one response, I'll take a shot. Vandersteen maybe better at soundstaging. Seems many studio monitors don't soundstage that great. But that's not the same as "sweetspot" and ATC's are acceptably good. ATC should be more dynamic, especially the active which have huge punch.
Haven't heard side by side but both seemed equally neutral, undistorted, and warmer, less fatiguing sound.