If you're looking to do this as a career, nothing beats an app you made yourself. I would give it much more weight in deciding whether to choose you as a developer than work you did for someone else. I don't know how much work you did on that other project, but I know with your own app you not only did it all, but you've shown me you can execute things on your own time without me bugging you. I suggest doing another one of your own apps, only make it kick-ass this time. Not necessarily in terms of have tons of functionality, but make it spiffy in the looks department and how snappy it is. A good suggestion would be an app that both solves a problem you have and shows off your skills.