B
I've said enough on this forum about this precise point and indeed, my opinion (i) is that a minimum of DP features is required in VS, and (ii) was that a dedicated app is/was needed.
However, I'm not so convinced any more: all the indications are that we'll have to wait until VS development is complete, and it will also be difficult to compete with InDesign/QXP, which are affordable for DP professionals (one job order is enough to cover their annual cost).
APh, APub & also AD are already good apps, and it wouldn't take much to make them very attractive to complex DP projects... and there are already so many great apps for photo editing...