Buildbot vs Test Kitchen: What are the differences?

Developers describe Buildbot as "Python-based continuous integration testing framework". BuildBot is a system to automate the compile/test cycle required by most software projects to validate code changes. By automatically rebuilding and testing the tree each time something has changed, build problems are pinpointed quickly, before other developers are inconvenienced by the failure. On the other hand, Test Kitchen is detailed as "Integration tool for developing and testing infrastructure code and software on isolated target platforms". Test Kitchen has a static, declarative configuration in a .kitchen.yml file at the root of your project. It is designed to execute isolated code run in pristine environments ensuring that no prior state exists. A plugin architecture gives you the freedom to run your code on any cloud, virtualization, or bare metal resources and allows you to write acceptance criteria in whatever framework you desire.

Buildbot and Test Kitchen belong to "Continuous Integration" category of the tech stack.

"Highly configurable builds" is the primary reason why developers consider Buildbot over the competitors, whereas "Automated testing" was stated as the key factor in picking Test Kitchen.

Buildbot and Test Kitchen are both open source tools. It seems that Buildbot with 4K GitHub stars and 1.37K forks on GitHub has more adoption than Test Kitchen with 1.62K GitHub stars and 543 GitHub forks.