I live in South Jersey, just outside of Philly. If I had the choice to live in PA or in NJ for my gifted child, I would choose PA. Granted, I only have experience with one school district, but getting accommodations is like banging my head against a very polite brick wall. NJ is required to provide gifted services, but there's no structure beyond that to explain what they need to be, and there's no funding. PA has a legally required Gifted IEP program that I often think would be very helpful to us as we advocate for our daughter.
As a grown-up giftie myself who was in a gifted program in a really great district, and as the aunt to several gifted kids in some really excellent districts in this area, I can say that most of the gifted programs are just fluff.
