Doing some quick googling, NJ has roughly 2 million higher population in a quarter of the size. Without looking at the enrollment numbers, i think a couple assumptions can be made:
1. Average school enrollment is higher in NJ, lending to the dialogue of bigger schools having better facilities, practice partners, etc.
2. Since the state is smaller, it may allow schools at certain talent levels to travel easier to find comparable competition, lowering "beatdown fatigue"
I'd be interested to see the enrollment numbers for NJ. I bet they are much more homogeneous than our state.