To reiterate, where in PA are you departing from - big state...
I live in the Lehigh Valley. I've rarely flown out of LVIA d/t not enough flights to work with our travel needs.
I prefer EWR over PHL because I hate dealing with Philly traffic and I'm Jersey born and raised

Also gotta add, we love flying Jetblue.
You can get cheaper parking at the airports if you use one of the many private lots. We've used the new SNAP indoor parking and had a great experience; I usually book through an airport parking reservation service. Not sure if I'm allowed to put the links here, but you can google PHL or EWR airport parking and you'll get a ton of hits.