fish. I think it has most things i want out of the box, so it should be simpler and snappier than my zsh setup. it's just that zsh hasnt bothered me enough to try it yet.
also nushell, im interested in the idea of manipulating structured data instead of unstructured text
Just take the dive into fish. It used to have a lot of problems with incompatibilities, but that's been less of a problem lately.
I haven't found nushell to be that great as a day-to-day shell simply because it integrates poorly with other Linux commands. But when it comes to data manipulation, it is simply amazing. I'm currently (slowly) working on a plugin to query LDAP. The ldapsearch command uses the LDIF format, which is hard to parse reliably. Producing nushell data structures that don't need fragile parsing would be a boon.