I personally would strongly recommend going the rust route having spent a decent amount of time learning Haskell. I think youll spend more time working on real problems and learn more about low level programming, in addition to the code being much faster.

I would say it depends on your goals. If performance is your primary concern, then go with rust, one of rust’s primary focuses is performance.

I don’t think of Haskell as the best language for command line dev, but I’m far from expert in either language.

Also try cython.