That’s not a ton of difference from Mite to Bantam. I’ve seen kids from either side go to the other league because teams and coaching were better in one over the other. Regarding PA kids playing in NJ for those ages, a lot depends on where you live and what’s available at the rinks around you. If you live in Yardley, for example, you close to Lawrence, Mercer, Grundy, and SkateZone, plus Princeton. Pick the team that offers the best program (coaches, travel, ice time, cost, etc) for what the kid wants.
In terms of Midget and high school, it largely depends on where you go to school. I’ve seen Tier 2 kids who play for the APAC teams go to the NJ so that they can concentrate on high school full time come November. Most of those schools practice twice a week, plus a game or two so the amount of ice they’re getting is about the same if not more. I have seen kids get a release to play in the DVHL, but that’s a bit less frequent. You should probably stay in the DVHL if you’re a PA resident whose high school team is on the ice maybe twice a week.
I’d love to see the DVHL implement the NJYHL season for the midget divisions so that kids can actually do things outside of hockey on weekends in addition to playing high school, but that’s apparently not happening any time soon.