When you see different static site generators in the wild, most people want:

  - api for creating pages from remote data
  - developer experience
  - build speed

But if you plan on using a headless CMS, your must prioritize decoupling the authoring from build times.

Your marketing team needs instant feedback, your options are now:

  - use client side rendering for page previews. (i.e. use a js-based framework)
  - containerize your project & run the framework's dev mode as a preview server (i.e. you might as well have not used a SSG)