I'm currently looking at this start tutorial video for
Good question. The difference is simple - there is absolutely no difference between the two except that certain HTML5 validators will throw an error on a property like
ng-app, but they don't throw an error for anything prefixed with
So to answer your question, use
data-ng-app if you would like validating your HTML to be a bit easier.
Fun fact: You can also use
x-ng-app to the same effect.