Difference between dependency injection between array and without array angular

Reading angular docs on dependency injection, there are two minification-friendly methods to do this:

Inline Array Annotation:

module.factory("MyStuff",['dependency',function(dep){...}])

The $inject property:

function MyStuff(dep) {...}

MyStuff.$inject = ['dependency'];

module.factory("MyStuff",MyStuff);

The inline one (first) is recommended. In one of my projects the style guide insists on the use of $inject property. I also see $inject property form quite often in open source code.