When comparing Comfortable vs Netlify CMS, the Slant community recommends Netlify CMS for most people. In the question“What are the best open source headless CMS's?” Netlify CMS is ranked 6th while Comfortable is ranked 15th. The most important reason people chose Netlify CMS is:
Experimental support for GitHub's GraphQL API is now available for the GitHub backend. Without mutation.
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Pros
Pro Easy and fast to start
Pro Flexible API
Pro REST and GraphQL
Pro Image Processing
imgix integration for realtime image transformations, such as resizing, cropping, face detection, etc.
Pro Powerful content collections
Pro Experimental support for GitHub's GraphQL API
Experimental support for GitHub's GraphQL API is now available for the GitHub backend. Without mutation.
Pro Easy Creating Custom Widgets option
The NetlifyCMS exposes a window.CMS global object that you can use to register custom widgets, previews, and editor plugins. The same object is also the default export if you import Netify CMS as an npm module. The available widget extension methods are listed here.
Pro Modern
Pro Open-source
Pro Built in React.js
Cons
Con Not open-source
Con Small team
Con A lot of configuration
Example: a few plugins and some code are needed for gatsby-img or markdown to work.