Depends on where in NJ you are coming from, 78 is a more of a safer gamble for less traffic during normal times, No clue what X mad traffic looks like. Google maps and Waze are your friend tomorrow.

Best of luck, be safe, if others find this and are looking there is a good dog friendly hotel in Fredericksburg, VA that has some ok food options. I use it as a half ish way stop to my folks in SC.