What's more hackable- Atom or VSCode?

It seems that vscode has won the race. I think atom fell out of favor a few years ago.

Frame challenge - neither, use Emacs for hackability.

What do you mean by hackable? Configurable? Extendible? Modifiable?

All of these. Basically which of these editors gives more power to the users to change the editor?

Yes you need to define what you mean by ‘hackable’

I mean to ask basically which of these editors gives more power to the users to change the editor?