Windows or Linux?

It really depends on your needs, Windows has a easy to use OOBE, Linux has distros that do have a OOBE (out of the box experience)
like Ubuntu, which uses the GNOME desktop environment. And Linux is Open Source! This means you can edit the source code and features, Linux is referred as GNU/Linux cause it uses a open source license called GNU general public license, Linux is more secure than windows, and it also has hard to use distros like Arch Linux for example. Mainly used in servers but it also works good on desktop