He's beating around the bush too much. The (unconfirmed but nearly inevitable) better visuals and Sony exclusive content would be the two most compelling reasons to go PS4 for Destiny in the eyes of the average gamer.
Yep, that is what I said initially. Just trying to show him what a poor argument is.
I'm guessing framerate, resolution, and it will have the larger install base of the current-gen consoles.