The evolver is supposed to be a wicked bit of kit... never had any experience with it so i can really comment on it.

I would view the sh201 as a live device primarily due to controls and keys.. (although i recognise that studio work would be just as good)

The microkorg i never liked due to its size, and im not a fan of korg VA stuff anyway. Korg excell (IMO) in mkaing those amazing digital mutli layer synths such as the X5DR or later incarantions utilising the multi's.. some fanatstic sounds on them and highly editable.

;)