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Whichever you’re more comfortable with and provides the features you want.
Define “sandboxed”
Application can only access a limited part of the system? = use flatpak or build a container/VM image using the nix pkgs.
Application can be uninstalled completely and has separate libraries? I prefer nix.
Nix apps are not sandboxed and you have no control of what resources they have access to or don’t, unless you wrap them with some other program
They can be isolated because Nix has in-built support for three different levels of sandboxing - virtual machines, containers as well as ephemeral shells.