Couple of things from me:
1) who cares if the model for the cover has changed, we have character creator, there is no "official V"
2) From an aesthetic point of view, I liked the other one better because it was closer to the classic ideal of femine beauty, but since she doesn't exist and even if she existed (as actress/model) the chances of meeting her would be closer to 0% than 1%, I prefer the new one since she has more "particular" traits than the generic one. The same applies to the old male V who was less handsome than the new one, but more "real"
EDIT: I forgot to write this as well. I actually would have preferred to have night city or something else on the cover, exactly because there is no "official V".