The property tax is insane. When I was born my folks had an enormous house in NJ, over 12k sf. There is nothing comparable in PA but they found something nearly as nice, and the property taxes are about 1/15th what they were paying in NJ.
However, they decided to leave because of the crime. When criminals find your house attractive and you’re not allowed to keep firearms (though the police overlook it in some cases), Pennsylvania has a definite allure.
new jersey is an agglomeration of small cities averaging around 50,000 people. Each one duplicates police fire and emergency services..etc.etc.etc. biggly costly and inefficient