When comparing GraphCMS 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 GraphCMS is ranked 11th. 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 Webhooks
Webhooks enable you to trigger custom code as soon as your content changes.
Pro Image processing
On-the-fly image transformations, such as resizing or cropping just by adding parameters to your media´s URL.
Pro Roles and permissions
The roles and permissions feature allows you to assign your collaborators different roles, such as Developer, Editor and Collaborator.
Pro Multi-project management
You can manage multiple projects and create up to 50 users per account to help manage those projects.
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 No content versioning
Con A lot of configuration
Example: a few plugins and some code are needed for gatsby-img or markdown to work.