I've tried both, and I'm still not sure. Claude Code steers more towards a hands-off, vibe coding approach, which I often regret later. With Copilot I'm more involved, which feels less 'magical' and takes me more time, but generally does not end in misery.
Turns out Gemini 3 Flash is pretty close. The Gemini CLI is not as good but the model more than makes up for it.
The weird part is Gemini 3 Pro is nowhere as good an experience. Maybe because its just so slow.