I didn’t switch from zsh, but from bash, to fish, primarily because bash was occasionally a bit clunky to use, and there were a lot of things that could be optimized in a modern environment. I settled on fish because it suited what I was looking for: an ergonomic shell that worked well out-of-the-box. Paired with strong community support, clean scripting syntax, and a wide ecosystem, it makes for a really enjoyable shell experience. I haven’t tried zsh, so I can’t compare the two.

I’m happy with fish, and I don’t see much benefit to switching to nu. nu is exceptionally good at one thing: working with data, but lacks features in other areas (auto-completion, scripting, etc.). With time, I can see these features being implemented, but I think they’ll be re-inventing the wheel in a lot of areas that other shells are already good at.