My number one reason for buying a ps4 right now is not the drm free restrictions because honestly I'm going to go all digital. As I've gotten older I realize I want to keep my games especially if keeps me from buying more games than I can play.
So what I'm excited about is the ability to put pretty much any kind of hard drive into my ps4. I already know I'm going to opt for a SSD since I'm going to play digital games. I can't say for sure, but I think its already been confirmed that xbone won't allow a SSD option or if there is one it will most likely be a ways down the line and require a MS license. Now you might say you can use usb 3.0 external hard drives, and to that I say those hard drives are shit. They have a high fail rate and from what I know they are far more expensive. I don't feel like getting ripped off by microsoft or wasting more than I have to on a hard drive.