One that is relatively up to date with their graphics drivers. Then just install steam/lutris flatpaks and go crazy. Performance difference is pretty much negligible once it’s set up.
or if you choose to install Windows, only reinstall with official media and uninstall the stuff you don’t need. Then go into privacy and disable telemetry.
don’t install these random debloater programs suggested in this thread, and most of what they do will get undone in a regular windows update anyways