[benologist]

Two benefits - multi-platform, and more extendable options.

I don't know how much you can extend this example (don't know much about Parse.com) but there's a whole lot of stuff that you can do with leaderboards that won't be handled out of the box by most platforms (except mine of course heh) - things like storing character and level information, screenshots, replays, etc with the scores, to make them a lot more interesting than a name and a number.