There's really no difference.
I'm kinda forced to at this point. My blue-ray scanner sh*t out on me, because that's apparently what great PS3s do. Yeah, that's right folks. Your PS3 could be in perfect care, but if that blue-ray scanner breaks, that's the end of disc gaming for you. Yeah, I'm bitter about it. Not going to waste my time/money fixing it when PS4 is right around the corner.
Anyway, I already have my copy preordered on the PSN store. Only things are this: You may have to wait for PSN store to update. It will on release date, but I think it may take longer in the day. Could be wrong, but hey.
You also don't get the case/map/case. I already know I'll just end up paying 50 cents for the map to my friend, or something like that because they never use theres.