Ha! Your thread was one that I found by searching when I was deciding between Start9 and Umbrel. And partly why I chose Start9. Thanks for that. So far quite pleased with Start9.
Regarding the migration issue with the blockchain noted earlier. Poking around, it looks like it would be easy just to copy the data into the appropriate folders in the Start9 installation. See:
https://docs.start9.com/0.3.5.x/service-guides/bitcoin/blockchain-copy