I'm proficient in Java/PHP/JS/Python/C. Between Rust or Go whats the easier language to learn?
Rust and Go are different tools that are good at solving different categories of problems. Additionally they are both languages that will provide different lessons about modern programming ergonomics.
If you expect your programming career to be solving more high level "enterprise-y" problems like writing APIs, web services, and middleware, learning Go is probably going to be more useful to you.
If you think your programming career is going to be more low-level like programming operating systems, libraries, or drivers, learning Rust is probably going to be more valuable to you.
Starting with go was far easier for me
Rust is more like c++. It contains not-so-easy concepts dealing with memory that require different approaches. It will take 6 months or more to get there.