When comparing Octopress vs Sitegen, the Slant community recommends Octopress for most people. In the question“What are the best static site generators?” Octopress is ranked 4th while Sitegen is ranked 32nd. The most important reason people chose Octopress is:
Octopress is designed to remove all the time-consuming and frustrating tasks you usually have to deal with when using Jekyll. You don't have to write your own HTML templates or do any configuration to get started. The default template also takes care of any basic CSS/JS you need to write to get going.
Specs
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Pros
Pro Very easy to use
Octopress is designed to remove all the time-consuming and frustrating tasks you usually have to deal with when using Jekyll. You don't have to write your own HTML templates or do any configuration to get started. The default template also takes care of any basic CSS/JS you need to write to get going.
Pro Lots of plugins (from Jekyll + 3rd party)
Another advantage of being based on Jekyll is default access to the extensive plugin system for Jekyll. There are also plugins developed specifically for Octopress.
Pro Based on Jekyll
As Octopress is simply a framework on top of Jekyll, it benefits from being based on one of the most popular site generators available. The primary benefit is that it is backed by git and is built in such a way that the site can be easily re-generated if the content changes.
Pro Uses Markdown for writing
Uses the Markdown syntax for writing blogs.
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
Pro Easy
It's pretty easy to get started with.
Cons
Con Not Actively Developed
Last commit is Feb 22, 2016, Social media hasn't been updated. Dead project?
Con Inefficient
Adding a new post, for example, causes the entire blog to be regenerated.