One great thing about Zola for static sites is that it's just a binary. Hugo shares that trait, but a lot of the others are built in Python or JavaScript and therefore come with gnarly dependency trees and package management problems that have given me headaches when trying to update a site after a few years of inactivity.

With Zola you just download the same version of the binary you used last time (or even commit said binary to the repo alongside the files) and you're on your way.

It fits in well with the general static site ethos of minimalism and constancy.