From the information we have available to us, it is pretty much set in stone that the PSN release will be available to the consumers before the retail. Whether this is by half a day, a day, or even next week is unclear. If you actually paid for an overpriced proprietary memory card and don't mind digital versions of games, the PSN version is certainly the fastest way to play it.
If you're in a place where it'll be in-store (like Gamestop) on the 30th, then that's the fastest way since the PSN doesn't update till afternoon to evening to night. If you are waiting on shipping or live outside NA, then probably PSN is the fastest way.
I'll be going digital since I like not fiddling with carts, and I bought an overpriced memory card. Haha. Seriously though, I will be, and I agree they're overpriced. But that's the route I'll be buying.