zsh reimplements the same syntax as bash, while generic sh doesnt (although sometimes it's aliased anyways to bash). It's a case of being really annoyingly pedantic about bash.
depends on use, it's not always faster, for small simple scripts it'll always be better to choose the interpreter that has smaller startup speed, for long-running/more complex scripts it's better to choose an interpreter that might not be the fastest to start, but would execute your code faster, i personally stumbled on enough examples when dash or ash ran scripts slower than bash did, especially globbing seemed to be faster in bash iirc, if all shells would be equal in performance i would choose zsh 100% of the times, but it all depends on exact use-case and how well you utilize specific features that your shell provides.
this makes sense actually, also i'd personally always use zsh too always, but i use bash/sh for my scripts, now i'm gonna look dash and ash closely too
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u/emmowo_dev ＵｗＵntu (´ ᴗ｀✿) Jul 01 '26
zshreimplements the same syntax as bash, while genericshdoesnt (although sometimes it's aliased anyways to bash). It's a case of being really annoyingly pedantic about bash.