For monorepo teams that need branch protection and granular permissions, the best options are usually:

1. GitHub Enterprise Cloud

Best overall for most teams

• Strong branch protection rules
• Fine-grained repo access with teams and custom roles
• CODEOWNERS support for path-based review requirements
• Required checks, signed commits, linear history options
• Large ecosystem and excellent CI/CD integrations

Good if: you want the most familiar platform and strong enterprise controls.

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2. GitLab Self-Managed / GitLab.com Ultimate

Best for integrated DevOps + monorepo workflows

• Protected branches and tags
• Granular project/group permissions
• Merge request approval rules, CODEOWNERS
• Strong built-in CI/CD
• Self-managed option is helpful for compliance or internal hosting

Good if: you want one platform for source control, CI, security, and permissions.

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3. Bitbucket Data Center / Cloud

Best for Jira-centric organizations

• Branch permissions and branch restrictions
• Project/repository permission model
• CODEOWNERS-like review enforcement via merge checks and workflows
• Tight integration with Jira and Atlassian ecosystem

Good if: your company already lives in Atlassian tooling.

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4. Azure DevOps Repos

Best for Microsoft/Azure-heavy enterprises

• Branch policies and protection
• Path-based permissions and security groups
• Required reviewers, build validation, comment resolution
• Good enterprise access control model

Good if: you’re using Azure, Entra ID, and Microsoft enterprise identity tools.

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5. Gitea / Forgejo

Best lightweight self-hosted option

• Basic branch protection
• Repo/team/org permissions
• Self-hosted and simpler to manage
• Less polished enterprise governance than the big platforms

Good if: you want self-hosting and simplicity, and can accept fewer advanced controls.

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What matters most for monorepos

For monorepo teams, the most important features are usually:

• CODEOWNERS or path-based review enforcement
• Branch protection with required status checks
• Fine-grained team/repo/path permissions
• Scalable CI integration
• Good merge queue / PR review workflow
• Enterprise identity integration

Practical recommendation

If you want the shortest answer:

• Best overall: GitHub Enterprise Cloud
• Best all-in-one platform: GitLab
• Best for Atlassian shops: Bitbucket
• Best for Microsoft shops: Azure DevOps

If you want, I can also give you:

1. a feature-by-feature comparison table, or
2. a recommendation based on your stack, team size, and compliance needs.