It's a combination of small things really. The mentioned ability to easily call on various models in the same prompt, having agent definitions be able to orchestrate other agents just by mentioning it in the description, doing things like goal/loop automatically.
replyThere is also IMO a distinct difference in "tone" in the dialogue. Claude seems to impersonate a human a bit more than I like.
Claude is of course very good as well and does a few things better than copilot too, but overall I'd prefer to use Copilot.
Same mindset here. I really like the ability of having OpenAI, Anthropic and other models available.
replyFor my personal work, I still use Claude Code as its cheaper and the limits don't bother me to much, but it feels a bit like being handcuffed to Anthropic vs being at work and freely selecting models.
Not OP but Copilot CLI is really straightforward, almost minimal in some sense. It's a lot like OpenCode but stripped down.
replyI also use the Copilot ACP server inside Pycharm and that works decently well too, although it has some annoying bugs, but if you're a Jetbrains user you're used to annoying bugs.