There's so much more to do in DL, so I agree you should park hop and do DL on Sat morning and DCA in the afternoon-night, and then spend more of Sunday at DL. Saturdays are definately the most crowded day.
The parks are very close to each other. You can easily parkhop back and forth all day. Since the FPs aren't connected between the two parks, you can spend your mornings at DL, get extra FPs, then go over to DCA. That way, if you want to go back to DL to go on FP rides, you can do them later in the evening and not have to wait in the longer lines.