Early entry is a key determining factor of where to start if you're a rope-drop kind of person. If you have access to it, go to whichever park has it. If not, start at the other park.
Since you have hoppers, I'd definitely make full use of them, especially since you can hold FPs in both at the same time. For our five day hoppers, we spent one full day at DCA (because one person in our party just had a one-park, one-day ticket so hopping was not possible with him), one full day at DL, and the other three days we bounced around - if we started at DL, someone would run over to DCA at some point to grab FPs for RSR for later, and we'd spend an hour or two at DCA doing that and other things. Our last day, we did a lot of bouncing to make sure we rode everyone's favorite thing before we left.