I still prefer Hugo to JAM. The lesser JavaScript, the better
Love Hugo, can go from git commit to serving in 30s. GCloud builder + GKE on a single n1 vm. JS shows up in the themes / customization, but for the most part you're only dealing with Markdown
What about bandwidth costs? With Google and AWS, bandwidth is expensive — have you considered the case where your blog gets suddenly super popular, or maybe DoS attacked? ... to me, that feels dangerous o.O what do you think?
I like Hugo too b.t.w., I've written a blog comments plugin for Hugo (and others), link in my profile.