Difference between module definitions in AngularJS?

Question

Angular

Hello. I read the styleguide on AJS and it says there that you need to define the module and its dependencies as follows:

// ./app.modules.js
angular.module("someModule", []);

// ./some/someCtrl.js
angular.module("someModule").controller("generalCtrl", ["$scope", function($scope) {
  // code
}]);

But it so happened that I got into the habit of doing it like this:

// ./app.modules.js
var someModule = angular.module("someModule", []);

// ./some/someCtrl.js
someModule.controller("generalCtrl", ["$scope", function($scope) {
  // code
}]);

What is the difference between these two methods and which one is better to use?