Delamination is a bit of a 2-stage process, you've got onset and progression. A curved plane is stronger than a flat plane, and takes a higher amount of energy for delamination onset to occur. But once it has occurred, the delamination progression is higher in a curved laminate. So if I am correct in saying that the question implies that all three laminates have catastrophically delaminated, then the curved laminate will show the largest delamination by area.
I've attached a case study that I think sums it up quite well. Figure 9 in particular gives a good visual.