Monday will be more crowded than Tuesday. This is true for both parks.
Hopping is very nice and easy. If you can get both kids to nap during a midday break, you should try to stay late and start early. To maximize what you can do you can open each park and close each park. Although with a 9am and 10am(9:30) it not worth hitting each opening you may want to get the extra hour at DL at the end of the day.
MM doesn't really affect crowd levels. As skiingfast said, it'll probably be more crowded on Monday, simply because Mondays in general bring in more people than Tuesdays, regardless of MM.