Personally, I'd go with hugo as it is fast at generating but I've used nikola for years as it is python based (my prefered language). I'd recommend checking out https://www.staticgen.com/ as it tracks SSG's popularity and gives nice info. A SSG built on a language/platform you are comfortable with is always a plus as sometimes you just need to get under the hood and ti.ker with things.
And for people who want "Hugo but written in Rust" or "Hugo but written in Javascript" — then, there's Zola (Rust): https://github.com/getzola/zola, and 11ty (Javascript): https://github.com/11ty/eleventy. (Or at least that's how I think about these two.)