i prefer mac os i know its a walled garden but most things are just done right in the os.
linux is:
- much leaner (you won't need even 4GB RAM)
- done right (+ macOS is not as good as it used to be)
- supported forever
- no surveillance mysteries (do Apple suck your data or not? they seem to try very hard to convince you that they could[/b]... but don't
)
"supported forever" is the most practical point, and servers are all about practicality imo. Look at it this way: you'll need to buy a new Mac, or start using Linux, when Apple cancel support for your hardware. Start today instead.