I use the Ensemble Oscillator mostly to get a instant evolving drone going and combine it with more sound elements.
I use the SWN mostly to start a complex sequence as a main leading sound theme >

Thanks for the in depth reply! Unfortunately, it looks like the only real answer is to get both, of course! But it seems like the EO might be a better team player in a smaller rack and more immediately impactful. That SWN seems like a dream, though. Maybe someday. Thanks again!