I am running BraiinsOS on 10 S19 Pros 100Th and find it pretty nice. Beware that you use smaller SD cards (not larger than 8gb) as they don't play well. Also, if you get a low quality SD card, you will be pulling them out and replacing them, so in an immersion cooling situation, that is annoyingly messy.
Low-quality SD cards or fake SD cards shouldn't be used to flash units because there are lots of fake volumes when burning or transferring the firmware to the SD CARD parts of the file will become corrupted which is why it ends up failing/does not work or sometimes your control board will lead to fully bricked that you can't able to recover it through SD card flashing.
SD card like Sandisk is the easiest one to find genuine or authentic, unlike Samsung SD cards you need to manually check them using an SD card checker to know if it's authentic or not.