I have found that Claude Code is better in every way I've used it. I like to use LLM's just as an advanced refactoring tool, especially where plain string search isn't enough. Anyway, my first experience of Copilot was it plainly lying that it deleted files I asked it to, and it insisted the file no longer existed (it did).

The difference between the two is stark.

"my turds now contains 15% candyfloss!"