I strongly suggest Linux. I've done both on the better hardware for Windows vs 2 generations older for Linux and it was night and day for performance.
A simple server Ubuntu install (and learning to use SSH if you want the server to be headless) aren't that hard. The big difference is that everything is command line.
https://linuxgsm.com/ is a fantastic resource for most of the servers you may want to host
My experience with this is going from a dual Xeon x5650 system with 24GB of DDR3 on Windows 10 to a headless 1U server with dual Xeon X5335 and 32GB of DDR2 on Ubuntu server. Ran a Minecraft server on each and the older system with the lighter OS was way ahead in terms of performance
I also found that display 1 & 2 were not level by a single pixel. One would think that Windows would have some better snapping on or at least an option to enable them.
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