I’d like to support Synology, but they are famous for making their NAS spec’d exactly at what it takes to do the job of a NAS, and not much more. QNAP is known to overspec their boxes, so they can run other beefy things.
The QNAP TVS-x71 line, for example, is the ideal NAS for Roon. It is very overpowered for a NAS. It’s like having a (not-top-of-the-line) NUC in a NAS form factor.
I cant find a comparable NAS by Synology. They are all weak Atom CPUs I wouldn’t recommend for any decent sized library.