When comparing ButterCMS vs Webiny, the Slant community recommends ButterCMS for most people. In the question“What are the best open source headless CMS's?” ButterCMS is ranked 13th while Webiny is ranked 14th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Integrate with any language/framework
Pro Advanced features
Integrations with enterprise systems, data compliance mechanisms, security, best-in-class tooling for Site Reliability Engineering, SLA based support, consultancy services.
Pro Accessible
Enterprise-grade capabilities accessible to everyone.
Pro Unified
Single experience that brings content creators and developers together.
Pro Serverless
Unlimited, responsive, and adaptable scale that’s cost-effective and fully managed.
Pro Open source
Released under an MIT license and architected for extensibility.
Pro Self-hosted
Webiny runs inside your own AWS cloud. Your data, under your own rules.
Cons
Con Not really open-source
Although API and SDK's are available on GitHub, the CMS source code is not.