All depends on your library size.
I tried OS X with Apple PCIe 512 SSD - didn’t work on very large library for me.
Now super happy with Intel Skull Canyon - running Roonserver headless on Win 10 for two weeks without any issues.
I’m not bothered with the fan noise, as it is server for me. I don’t put it in the music listening room, but have it general TV room in closed cupboard, to feed two casual listening zones in realively noisy environment. So while fan some noise is there, it is OK.
Just ordered 2nd Samsung 950 Pro 512 PCIe SSD to create RAID 0 to speed up search.