I experienced issues with the VS Code plugin as well, though not as severe as you described. If I had the same issues, I wouldn't use it as well. I haven't experienced any issues ever with IDEA vim. I haven't used XCode in a while, so I can't chime in on the current state of the plugin. My ranking for most stable to least stable plugins I've used would be the following (in case of multiple plugins, I don't recall the exact one, sorry):

- QT Editor - Eclipse - IntelliJ - Visual Studio - VS Code - XCode

At the moment I mainly use VS Code, and I'm still editing much faster, despite the issues (occasional undo hiccups and error messages).