Angularjs: factory vs service

AngularJS Factory and Service is easy to distinguish and write.

1. Factory:

   Factory can be treated as a object object = {}: so Object.create(), object property/method are available.

2. Service:

   Service can be treated as Function, function Service(){}: so prototype, this, apply(parent, arguments) are available.

The following is my demo to use both of them. It would be great to extend factory/service based on pure JavaScript object/function inheritance. http://jsfiddle.net/williamjxj/1srnfcgw/4/embedded/