I am a Nix user, but one advantage that Bazel has is that it can do more fine-grained incremental rebuilding (nix as commonly used can only do per-project rebui

I am a Nix user, but one advantage that Bazel has is that it can do more fine-grained incremental rebuilding (nix as commonly used can only do per-project rebuilds). Also while there is some overlap, Nix usually relies on language-specific package managers to perform the actual building, whereas bazel handles that itself. Nix is more of a packaging tool, whereas bazel is a build tool.