C is easier to learn, hard to use well. Rust is harder to learn, but easier to use well.

C is an easier language to learn that Rust because it's simpler. That is deceptive though - you may understand the language, but it takes years to understand how to use it properly and safely. Rust has a bit of a learning hurdle at the start, but once you understand the language it's much clearer how to use it effectively and safely.

(C++ is the worst of both worlds)