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
Manjaro Linux
Manjaro Linux is a fast, user-friendly, desktop-oriented operating system based on Arch Linux. Key features include intuitive installation process, automatic hardware detection, stable rolling-release model, ability to install multiple kernels, special Bash scripts for managing graphics drivers and extensive desktop configurability.