I think fish is the best interactive shell. It’s not completely POSIX compatible but it’s close enough for day to day use. I switched from zsh to fish years ago and would recommend anyone using zsh to try it out. Fish provides a customized zsh experience, but out of the box without plugins. It also doesn’t have the compgen performance issues you get with zsh.

For shell scripting I’d stick with POSIX sh or bash.

I switched to Fish from Zsh and never looked back. That said, love the shoutout to scsh, which has the best manpage of all time (also Olin was a great professor, I learned compilers from him)

Bash scripts are ran thorugh bash, not fish…

So if they messed up the shebang, I’d do bash that_script.sh

I am currently on windows, I will try to move back to linux sometime in the future
I think Object Oriented Shell (Shells that pipe objects not string) are a very good idea

I like powershell a lot, i think nushell tries to replicate this OO style but maybe to a more unix oriented audience, so i try to use it from time to time and learn more about it

But bash is the only simple life and realistic option for linux

So in summary

1. pwsh on windows
2. bash on linux
3. nushell for the rebellion

a long term TERM user