What SO I must install for NAS + HTPC

[trompe]

Hi!!!
I'm new user of this microserver HPE Gen10.

I would like to use the MS G10 as a HTPC and NAS server in my principal living room near to the Receiver AV.

So I'm very confused about what is the "correct" SO that I must install.. because I would like to use some SO that allow me work with a NAS Server and Use displayport output to use microserver has HTPC (In my best wishes includes to use it as game for my childs...) It's possible?

I discard esxi solutions... because if I virtualized I lose graphical output... so what recommend me? 

Windows 10?
Windows Server?
Xpenology?
Debian?
Other??