This about covers it...for the record I have the Space and Im selling it to get a Big Sky if that means anything....Owned both, still have the BigSky. The modes are more intuitive and a little less out there compared to the Space which makes it preferable for my uses. Most importantly- the buffer and analog dry through is vastly superior to the Space. The buffer on the space was a deal breaker.
Sure there were more wacky tones that blew my mind in the space. But for lots of shades of everyday day verbs from halls/plates/rooms/springs/ambient clouds all with unique and awesome modulation sounds that are unique to each machine- it's an inspiring but much more organic experience. To me the BigSky sounds like you're floating down a river looking up at the stars and experiencing the wonder of the universe while noticing the moss on trees and organic swells of life. The Space sounds and feels like journey through the vast cold and inorganic universe of light and darkness. There's a coldness, a scifi sound effect quality to many of the coolest tones, and it lacks warmth compared to the BigSky but feels more distinct as the effects are more out there and powerful.