I think actually that the frontend project with all of its thousand of files and components is easier to handle just because typescript helps me so much.
I'd do a simple CRUD app in all 4 of them and see which one I liked best from tooling to language design.
Language preferences are very personal but I personally like Golang. It's kind of like a "batteries included" language and deploying Go, which is copying a binary to a server is awesome!
Nowadays, deploying any project should just be one docker build . away whatever the language.
Rust is great but more clunky. I'm under the impression F# is a viable alternative.
Nice bonus: the resulting app is native and fast.
Can’t recommend it enough.
declare(strict_types=1);