Studio 13.37 sounds somewhat interesting, but I have found nothing from the developer on what optimizations have been made (not even in general) or how those optimizations benefit audio performance other than a vague description of lower latency. He does show a
reported latency figure of 2.67 ms in a screenshot of Jack that is usable for recording the output of Hydrogen to a single track in Ardour (at fairly high cpu use):
https://www.youtube.com/watch?v=HHZMW1n2AOc <---- "Contains advanced technology".
But that doesn't tell us what the actual roundtrip latency is for running a real-world project. And it doesn't tell us which audio device was used (for fair comparison to other distros).
And... We can't try before buying. We aren't guaranteed any type of support if there are problems. I.e., we don't really know what we would be getting, what troubles we might have, whether we could work out any possible issues.