Debian
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system is called Debian.
VS
Peppermint OS
Peppermint OS is a Debian- and Devuan-based (previously a Lubuntu-based) Linux distribution that aims to be fast and easy on system resources. By employing its Site Specific Browser, Peppermint integrates seamlessly with cloud and web-based applications.