Zig is way better than C in many other respects, so if you want a modern sane language and you're either a Rust luddite or working on a project where memory safety isn't that important, it might be attractive.
Like, if the choice is C or Zig, then Zig is pretty much a no-brainer (or it will be when it hits 1.0). It just fixes so many insane things about C that have been broken for literal decades.