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I was actually playing SDS cellos while watching the ARO walkthrough, and didn’t hear a tonal or dynamic difference that induced any FOMO, but at that moment of the demo where Paul discovers his highest available octave, I did suddenly notice that the ARO cellos have an extra octave over SDS up to E5 at the top, which could arguably be useful.
I’m away from my main rig, but I also have MSS on this computer, and even that only goes up to C5, not E5. Of course, it’s rare for a whole cello section to be up in that viola/violin range but it could happen, I guess. That said, it’s not something I’d pay a premium for, and the nice thing about SDS is that you can get intense enough with the B Stage ensembles to simulate stratospheric celli using violas!