Rust libraries are so good these days I would probably choose it over Haskell in most situations. Before i would say Haskell is better for server stuff but im not sure thats even true anymore
Discussion
How's your functional reactive programming.
Btw rgd. "server stuff". Haskell is expanding into the desktop, mobile and web spaces. SimpleX's desktop and mobile apps are written in (mostly) Haskell and you know that.
Haskell web frameworks like Miso are looking good -- have used Miso for a small-ish web app, I don't see why it wouldn't scale to something bigger.