I added Rust and Dart as established comparisons. I also added the keyword "array" to filter out and non programming language searches. I tried the alternative filter word "string" and obtained similar results.
Extending the time window to 5 years still didn't show either one to be trending over the other.
Curiously, I did try Stack Overflow's trend page but zig and nim tags were missing.
There's no obvious winner (IMHO).