I definitely don't know anything best, in part because the answer has much to do with what you value and what you are already familiar with.
I've used Middleman and Jekyll on several projects. I've avoided the React- and Vue-based ones because I don't have a lot of experience with those tools (though I plan on learning Vue soon, so I'll probably them explore Gridsome).
When I wanted to include a static site generator in my curriculum, I opted for Eleventy because it had minimum set up and was guaranteed to work for my students who were using a mix of Windows and Mac laptops. So, despite familiarity with other generators, what was "best" for my situation was a new-to-me tool.
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