When comparing Squidex vs GraphCMS, the Slant community recommends GraphCMS for most people. In the question“What are the best open source headless CMS's?” GraphCMS is ranked 11th while Squidex is ranked 15th. The most important reason people chose GraphCMS is:
Webhooks enable you to trigger custom code as soon as your content changes.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source
Pro Versioning
Pro Powerful rule engine for integrations
Pro REST and GraphQL
Pro Slick UI
Pro Generous free package
2 locales, 2 collaborators, many API calls

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.
Cons
Con Limited to SImple Content
Limited to simple displaying of contents but will struggle with complex business rules ie ones that require cascading drop-downs, complex nested documents, etc..
Con Un-debuggable Script Editors
You can't debug any of its in-built script editors
Con References
It will allow you to delete references which are used by documents and when you come to open those documents, it will then perform its 'shake' logic to remove it (make it balnk') and will also disappear from history / versioning
Con UI can be messy to navigate for an editor
Con Small team
Con Not open source

Con No content versioning
