Copilot delivers clearest value on Microsoft 365-native tasks, specifically Teams meeting summaries, Outlook email drafting, and Word document creation, where data integration creates a genuine advantage. GitHub Copilot shows stronger developer ROI, with an 8.69 percent increase in pull requests and 84 percent better build success at Accenture. Pairing Copilot with ChatGPT for general tasks typically outperforms single-platform mandates.