1. 1. Scalability and Deployment Flexibility: AWS CodeBuild is a fully managed continuous integration service that provides scalability and deployment flexibility. It allows users to build, test, and deploy their applications at any scale, without having to worry about server provisioning or management. On the other hand, Bazel is a build and test tool that focuses on providing fast and reliable builds. While it is highly scalable and can handle large codebases, it does not provide the same level of deployment flexibility as AWS CodeBuild.
2. 2. Language and Platform Support: AWS CodeBuild supports a wide range of programming languages and platforms, including Java, Python, Ruby, Node.js, and Docker. It also integrates seamlessly with other AWS services, such as Amazon S3, Amazon ECR, and AWS CodeDeploy. Bazel, on the other hand, primarily targets the build and test needs of larger software projects and offers support for multiple languages, including Java, C++, and Objective-C. However, it may not have the same level of compatibility with various platforms or provide the same level of integration with other third-party services as AWS CodeBuild.
3. 3. Build Configurations and Configuration Management: AWS CodeBuild allows users to define their build configurations using a simple and declarative YAML file. This file can be stored in the source code repository, which makes it easy to manage and version control. Bazel, on the other hand, uses a BUILD file to define build configurations. While Bazel's BUILD file provides more fine-grained control over the build process, it may require more effort to maintain and manage, especially in larger projects.
4. 4. Pricing and Cost Optimization: AWS CodeBuild offers a pay-as-you-go pricing model, where users are charged based on the build time and resources consumed. It also provides cost optimization features, such as build caching and parallelization, to help minimize costs. Bazel, on the other hand, is an open-source tool and does not have any direct costs associated with it. However, the use of Bazel may require additional infrastructure and resources, such as build servers, which can incur costs.
5. 5. Integration with Development Tools and Services: AWS CodeBuild integrates seamlessly with other AWS services, such as AWS CodeCommit, AWS CodePipeline, and AWS CloudFormation. This allows users to create end-to-end continuous integration and deployment pipelines using a variety of development tools and services. Bazel, on the other hand, is primarily focused on providing a fast and reliable build system and may not have the same level of integration with external development tools or services.
6. 6. Community Support and Ecosystem: AWS CodeBuild is part of the broader AWS ecosystem, which has a large and active community of developers and users. This means that users can benefit from community support, documentation, and resources when using AWS CodeBuild. Bazel, on the other hand, also has a growing community and ecosystem, but it may not be as large or established as the AWS community.

In Summary, AWS CodeBuild provides scalability, flexibility, and integration with AWS services, while Bazel focuses on providing fast and reliable builds with support for multiple languages. The two tools have different approaches to build configurations, cost optimization, integration with development tools, and community support.