Following directive will be translated to style="color:red"
And ng-class directive translates your object into class attribute.
Following will be translated to class="deleted" when isDeleted variable is true.
There is one more use case for ng-style. If you want to interpolate something in style attribute, you should consider using ng-style. Otherwise, that would not work before Internet Explorer 11 as documentation suggests.
So, instead of using style: