I'd agree Coen tenders are pretty good. Had to eat them a couple times in a pinch. Much better than Sheetz or WaWa for that one product.
At Sheetz, pretty much only the fried things are good (chix sandwhich, tots, mozz stix, pickles, etc.)....and it's not really hard to make fried food taste good. The deli meats, burgers, etc have low quality ingredients. Locally, GetGo has much better subs.
On the other side of the state, WaWa probably has better subs than Sheetz too, but not as good as GetGo, However, WaWa gets an advantage for having pre-made hot foods right at the registers. If I'm on a road trip and need a quick snack and fill-up, I don't really care that the chicken tenders or wings have been under a heat lamp for a while - they are junk food regardless - I just like the convenience of grab and go and get back on the road. Sheetz will cost you 30 minutes waitng for MTO.