After conducting research, the key differences between Nix and Pacman package managers are:

Nix can handle dependencies in a more granular way, allowing for multiple versions of packages to coexist on the same system. This reduces the risk of dependency conflicts and makes it easier to manage complex software stacks.

Nix allows for atomic upgrades and rollbacks of packages, which can be useful for system administrators who need to manage critical systems.

Nix has a more declarative approach to package management, where users define the desired state of the system and the package manager ensures that state is achieved. This can make it easier to maintain system configurations over time.

Based on these differences, a use case where Nix would be better than Pacman is when managing complex software stacks with strict dependency requirements. Nix's ability to handle dependencies in a more granular way and allow for multiple versions of packages to coexist on the same system can reduce the risk of dependency conflicts and make it easier to manage the software stack over time. Additionally, Nix's declarative approach to package management can make it easier to maintain system configurations over time, which can be beneficial for system administrators.
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