I am not east coast but I think it comes down to whether or not you have a concern about eating late/close to bed (some people have digestive issues, etc). You will not starve on the ship if you do late dining - there is food everywhere. My family tends to do everything later on vacation because we try to pack so much stuff into our day, so we generally prefer late dining even with little kids. Late dining lets you maximize pool time and have a less crowded MDR. So, I would default recommend doing late dining, unless you have a specific reason not to.