Manjaro was based on the Arch Linux distribution, but uses its own software repository. The assumption of distribution creators is user-friendliness, while maintaining basic compatibility with the Arch Linux distribution. In particular, like Arch, Manjaro uses the Pacman package manager and the unofficial, additional AUR software repository (short for Arch User Repository).
Manjaro contains three official software repositories: Stable - whose packages have been checked and found stable by the developers of the distribution; Testing - packages currently being tested, potentially unstable; Unstable - packages not tested and potentially dangerous for the proper functioning of the system.
Debian is the best