GitHub anchors team workflows with PRs, Issues, Actions, Codespaces, and Copilot—best when source control, security, and automation must live together. Vercel excels at Git-connected deploys, edge/serverless compute, previews, and an AI SDK, ideal for JS frameworks and rapid shipping. Cursor complements them as an AI-first editor with multi-file context, agentic refactors, and repo-aware chat for faster iteration.