I've used Claude Code, Cursor, and Copilot is Vscode and I don't "know" that Claude Code is better apart from the fact that it runs in the terminal, which makes it a little faster but less ergonomic than tools running inside the editor. All of the context tricks can be done with Copilot instructions as well, so I simply can't see how Claude Code is superior.
For code generation, nothing so far beats Opus. More likely than not it generated working code and fixed bugs that Gemini 2.5 pro couldn't solve or even Gemini Code Assist. Gemini Code Assist is better than 2.5 pro, but has way more limits per prompt and often truncates output.