Speed and stability, search, command palette, file navigation, Goto.

And the excellent Python plugin API, which has made the plugin ecosystem so vibrant. Here's one I wrote, https://github.com/kylebebak/Requester, an HTTP client that goes toe to toe with Paw and Postman on features and outdoes them on usability.

I couldn't have have written something like this for any other editor, or any other platform.