When comparing Gatsby JS vs Sitegen, the Slant community recommends Gatsby JS for most people. In the question“What are the best static site generators?” Gatsby JS is ranked 9th while Sitegen is ranked 31st.
Ranked in these QuestionsQuestion Ranking
Pro No page reload when navigating
Pro Based on React.js
Editing markup is phenomenally easy when you have components.
Pro Live reload
Every change you make can be almost immediately seen in a browser.
Pro A lot of plugins
Gatsby offers a lot of plugins to integrate tools like SASS, typescript, styled components, etc.
Pro Very active development
Gatsby is very actively developed and the maintainers are very helpful.
Pro Built-in code and data splitting
Pro Open Source
Pro Take content from any source
Gatsby can generate the pages with content from any sources like Drupal, Wordpress, Contentful, etc. If the source plugin is not coded for your solution, you can create it.
Pro A static site and a React app in one
The static pages are generated by Server Site Rendering of the React app. So you have all benefits of a static site, and all benefits of a React app, which is very powerful.
Pro GraphQL Data Layer
Pro A lot of examples
Gatsby have a lot of examples sites in his github repository.
Pro Beautiful out-of-the-box blog starters
Pro Easy configuration
You configure the site with a site.moon file. It is written in MoonScript.
Pro Powerful templating
It uses the cosmo templating language. It enables you to inject stuff into the page as it is being generated.
Pro Extendable through plugins
It has a plugin system. It comes bundled with some plugins already, like syntax highlighting. You can write your own plugins.
Pro HTML and Markdown
Pages and templates can be written in HTML or Markdown
It's pretty easy to get started with.
Con A bit raw
You'll maybe have to tweak some JSX if you want something that's not covered by available themes.