Is there benefit of buying one version over the other? Like hardrive space or speed?
EDIT: I use the Xbone.
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Technically the PS4 should be able to read from the drive faster than the disc. Is it noticeable? No. If you buy digital you can't lose it unless PSN shuts down. With a disc your dog can kick it under the tv as your switch discs and you'll need to buy a new one (FE: Radiant Dawn RIP). The PS4 doesn't support external hard drives but storage can be upgraded to 2T (I think). So storage shouldn't be an issue (for a while at least) if you did that.