*I spent two days pair-programming with two “equally powerful” AI coding tools: Claude Code with Sonnet 4 and Roo Code with local Qwen3-Coder. Official leaderboards insist they’re statistical twins. Yet after hours in the trenches, the only thing they truly share is a mutual hatred for my variable-naming conventions.

Here’s the delta nobody writes unit tests for:

Tooling surface area  Claude Cod…*