Rust seems harder but it allows for compiler guided development. So there's a bit of an upfront learning cost but the maintenance cost is lower. If you change something in an enum variant, the compiler will basically tell you what to change everywhere in your codebase.
Specifically, Rust code has less assumptions, with lifetimes, mut, etc., Rust code is much easier to read. If I read a function, I need less awareness of other parts of the codebase because so much of the information is just there.
Counter-point: This is clearly not perfectly true, considering that I would still recommend Typescript over Rust for web dev.
More elitist take:
Rust is not hard. If you can pass a college algorithms class (i.e you can understand BFS/DFS/DP/Network Flow), you can understand Rust.
If your developers cannot write Rust code, you will probably pay the price in whatever language they write.
Counter point: This is clearly not 100% true since I would not say the same thing about Haskell even though arguably I could.