First of, hi to everyone :D

I just purchased all the bits and pieces I needed to rebuild an older PC into what will become my home gaming server machine. It's not strong, but I have 64gb ram, Ryzen 5 5600x cpu and some other bits and bobs .. I have an old 1070TI gfx card IF needed to be used ( but I would prefer to use the onboard gfx port, as I do have a headless dongle ).
My plan is to add 2TB M.2 and 2x2TB SSD discs to it.

Now .. my problem is that I can't decide weather I should buy Win11 Pro, use my existing Win11 Home or start with Ubuntu Server .. I have little to no experience with Linux but have been told Ubuntu Server is not hard to learn.

The games that is planned to be hosted are ( as of writing )
Conan Exiles
Minecraft Modded server
7 Days to Die
Space Engineers
SCUM ( When it releases the server files at v1.0 )
ARK ( Either Evolved or Ascended )
Rust

A maximum of 2 (maybe 3 at most) servers will be active at all times ( we switch one out when we fancy something else )

Some people tell me that Ubuntu Server with Pterodactyl is the way to go, while other state Use AMP on windows, while others again come with other solutions...
One thing they all have in common, is that I can't get a better explanation on why, nor info on how to use ( I don't mind learning new things, it's what make one better :D )

What are you guys take on this?

Windows server?? ( if so, home or Pro? )
Ubuntu Server ( and Pterodactyl or something else/better? )

edit:
I forgot to state I will need to have this autostart/login ( this I know how to on Windows, but not on Linux, so I don't know if this even is a thing on Linux )