I guess integration with their other products is one advantage, but really, most other consoles have smartphone apps as well, and they're nothing special. The integration with Airplay that TFA touts seems rather dubious... isn't that just normal QOS any old router can do?
EDIT: The most obvious advantage, I guess, is the large corpus of devs who are willing to rewrite their apps to target a new form factor. No other company right now commands that sort of manpower, and that, indirectly, may be enough to convince content owners and game publishers to target their platform.