Should a controller call a service or factory?

This question already has an answer here:

angular.service vs angular.factory 9 answers

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Use factory if object definition syntax is preferable

app.factory('factory', function () {
    ...
    return {
        value: '...'
    };
});

or it returns something that is not an object for some reason.

Use service if this syntax is preferable

app.service('service', function () {
    this.value = '...';
});

or it should return an object created with new from another constructor, eg

app.factory('factory', function () {
    return new someConstructor();
});

vs.

app.service('service', someConstructor);

A good use case for service is that you can seamlessly refactor existing controllers with controllerAs syntax to inherit from common service, in this case no this statements replacement is required, as shown here:

app.service('parentControllerService', function () {
    this.value = '...';
});

app.controller('MainController', function (parentControllerService) {
    angular.extend(this, parentControllerService);
});

app.controller('ChildController', function (parentControllerService) {
    angular.extend(this, parentControllerService);
    this.value = '!!!';
});

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