I totally agree with the "try both", but if part of your motivation to learn one is to use it for a job, Rust is more mature than Zig (Zig is not yet 1.0, and still making exciting breaking changes to the languag), and Rust currently has more adoption than Zig- parts of Firefox, Chrome, Android, Windows, Linux, AWS, Azure (and I'm sure thre are more).

Zig is gaining integration into larger projects (Ghostty, TigerBeetle, Roc, Ubers build system come to mind), but it's not yet achieved Rust's success