Whats the Best OS?

I've used Win 10 & several Linux based distributions

In my opinion there is no single best operating system, it all depends on what the need of the user is. If you're just an average consumer with no real understanding of the internet of things, then Windows is probably the best choice.
If you're someone who really wants to learn more about technology and programming, a Linux based Distro would probably suit you more. Good ones to start out with would probably be Debian/Ubuntu/Linux Mint.
If you're already experienced in all of the aforementioned, then why are you here? :lol: In all seriousness though, probably Gentoo or Arch for those types of people.