I recently looking into different static site generators and I chose Hugo in the end because I found their documentation to be very clear.
The Hugo framework can do a lot of things out of the box, without the need of plugins like most other frameworks. I saw this as an advantage, but I can understand you might want to go for something more simple if you don't need any of those features.
I actually wrote an article about why I choose Hugo, on the site I made using Hugo: https://verummeum.com/blog/2018/09/02/how-verummeum-is-build...