It depends how proficient you're in Rust. Once Rust itself is not a difficulty for you, there's a lot of productivity gained from having a modern language with many conveniences, and great tooling.

Rust moves more bugs to compile time, so you will technically spend more time getting the code to compile, but in my experience in 99% of cases it's a time saving. And it lets you be more confident about a program correct by construction, rather than merely fuzzed and not observed to crash. The 1% of counter-examples is trying to be too clever with generic interfaces and hitting Rust's limits.