Claude Code will write the whole thing for you. Whereas doesn’t Copilot require input along the way of coding? ie- it doesn’t do all the programming for you
If you give Copilot a file with a list of tasks to complete, it will try to churn through them (just like most other harness would do these days).
It can code the whole thing for you, copilot in vscode is simply better, people just never tried it.