model.onDidChangeContent vs editor.onKeyUp in monaco editor for validation and autosave

I am wondering the difference between these two method: model.onDidChangeContent vs editor.onKeyUp

So for example, I got two scenarios here:

• Doing simple syntax validation when user editing on the editor
• Autosave functionality

One thing I am pretty sure is I have to debounce the change (say 500ms) and then call related event handler. However the problem here is i am not sure when event i should use to accomplish these two functionally. Looks like onChange(onInput) and onKeyUp most of the time show same behavior.

The event onDidChangeContent is also triggered for other changes like code actions (e.g. selecting a completion item) or commands (e.g. paste), not only key events. So it's clearly the better choice.