Based on experience and some questimates, I can see Epcot being slower in the 1st. If everyone went there on the 31st they may move on to another park the next day. But like I said before, that whole week is pretty insanely busy so I'm not sure if there is a whole lot of difference. Since the 3rd is a Monday and generally when schools start back up again it could be a slower day, along with the 4th.