I have been down this route when deciding to purchase a KDS/Katalyst recently.Well it’s definitely not about the size of the case with ADSM. You could almost fit two ADSM boards in one case. So probably they just want to phase out the old design and that makes perfect sense. And they probably want to delay Organik DAC for lower priced units to sell as many as possible with the affordable 40k (€) price tag before starting to sell the same technology for far less money. What I’ve read and heard is that the difference between Klimax Katalyst and Akurate Katalyst is very small. It will probably be the same with Selekt Organik and Klimax Organik.
I found a stark contrast between my ADS3/Katalyst,Klimax performance with Katalyst was exceptional.
Having scaled the heights in acquiring my own Organik upgrade to the KDS I am in awe at its performance!.