Microsoft Copilot vs DeepSeek V4: Which Is Better in 2026

I spent last Tuesday watching our finance team try to reconcile quarterly projections. One analyst was manually copying data from Outlook into an Excel workbook, while our lead developer in the next room was debugging a massive Python codebase. Both were using AI, but their tools might as well have been from different planets. That's the reality of picking an AI assistant in 2026: the "best" tool depends entirely on whether you're push