if i had to pick a Windows, it would be either, 2000, 7, or XP. depends on the application, but those are the best. hardware firewall reccomended. spelling correction requested
W10 is more secure in this point, way better Defender and Firewall (Third party security soft not longer needed), Secure-Boot, second Keyring encrytion for Passwords, among other measures.
I have found W10 Firewall to be remarkably robust, if not insensibly overcomplicated -- and impossible to control, when you realize Steam and other apps can change the rules, or create new rules. There's a cool download called Windows 10 Firewall Control, or something, it was bought by Malwarebytes and is maybe still maintained. Not sure that Steam can't still have their way.