Only difference I found is that the un-authenticated MPNS have a limited amount of daily push notifications, I'm afraid about that another difference is this that un-authentication don't recognize the end-user. I'm right or wrong with this one? Or maybe there is other difference between this two?
Unauthenticated MPNS Push are limited to 500 per day while authenticated MPNS Push are not throttled and authenticated push are delivered to MPNS via SSL connections that are established using a certificate issued by Microsoft trusted root CA authority.