There isn’t a single universally “most trusted” CI/CD platform, but for speeding up multi-repo builds while keeping reliability high, the strongest mainstream choices are usually:

Best overall: GitHub Actions

Why it’s trusted:

• Very widely adopted and actively maintained
• Strong ecosystem and first-class integration with GitHub repos
• Good caching, matrix builds, reusable workflows, and environment protections
• Easy to standardize across many repos

Best for:

• Teams already on GitHub
• Multi-repo workflows with shared reusable templates
• Fast adoption with decent reliability

Best for enterprise reliability: GitLab CI/CD

Why it stands out:

• Mature, end-to-end CI/CD platform
• Strong pipeline controls, permissions, and auditability
• Good support for monorepo and multi-repo patterns
• Reliable for complex release pipelines

Best for:

• Organizations wanting a more integrated DevSecOps platform
• Teams that value governance and consistency across many repos

Best for flexible, high-scale builds: CircleCI

Why it’s popular:

• Fast pipelines with strong caching and parallelism
• Good workflow orchestration across multiple repos
• Generally easy to optimize for build speed

Best for:

• Teams focused on build performance and developer velocity
• Larger engineering orgs with many independent services

If “trusted” means strict enterprise control: Jenkins or Azure DevOps

• Jenkins: extremely flexible, but more maintenance burden and less “trustworthy by default” unless heavily managed.
• Azure DevOps: strong enterprise integration, especially in Microsoft-heavy environments.

Practical recommendation

If your goal is fast multi-repo builds without losing reliability, I’d usually recommend:

• GitHub Actions if you’re already on GitHub
• GitLab CI/CD if you want the most robust all-in-one enterprise pipeline platform
• CircleCI if build speed and parallel execution are the top priority

If you want, I can also give you a ranked comparison table for your specific setup (GitHub/GitLab/Azure, team size, cloud, compliance needs, build volume).