It's probably going to be slammed either way, based on my experience this weekend (OBB Sunday). People with 1 park per day will all want to go to DL so they get a full day. Those with PHs may start at DCA, but they will hop to DL when the event starts, crowding DL even further. If you have a PH, I would start at DCA and then hop to DL when you have to, booking some LLs at DL in the afternoon for evening, if possible.