They're really completely different. Fish is mostly about having features that help you enter a command (history, error checking, completions, etc). Once you ex

They're really completely different. Fish is mostly about having features that help you enter a command (history, error checking, completions, etc). Once you execute something, it really behaves the same as bash/zsh. Nushell is really more about command output (my understanding, I haven't used it heavily). With Nushell you can do things like parse TOML files right in your shell: open Cargo.toml | get package.version Nushell understands the structure of data but fish is like bash/zsh in that it just deals with streams of text. Nushell can even interact directly with sqlite databases which is very cool. I think if you're just looking for a simple shell that behaves a lot like bash/zsh, use fish. I think Nushell is more targeted to people that want to use its powerful data pipeline features—or are generally interested in a bigger departure from bash/zsh. Personally I prefer fish, but I should start using Nushell more since it could definitely help with some tasks. I probably would just run Nushell when I need it though, I don't see myself running chsh to switch over.