but I have done a TON of research...
DDP would cost you about $1300 for 6 days for 4 adults/5 kids (all 10 & under).
You are doing 6 TS meals. At $25/adult & $10/child for each of those TS meals, you are already at $900...
If you are planning CS for all lunches...say $10/adult & $5/child for the 6 days, is now another $600...
We haven't even added snacks...
SOOOOO....you are already at $1500, probably conservatively...
I'd say the DDP makes better sense, financially. Looks like you could spend MORE OOP for the same meals. I'd say get the DDP and then not have to worry about prices!
We weren't going to do DDP, but DM said while we COULD eat for less (but not A LOT less) at WDW, it would require serious effort...and a lot of "NOs".
We will eat breakfast in our room (bring pop tarts/cereal bars/small cereal boxes/protein bars/coffee; buy milk, juice w/ snack credits). We figure CS for lunch daily, TS for dinner daily (dessert may be breakfast the next AM!

), and then the kids can have a snack of choice each day!
The freedom to order WHATEVER I want from the menu w/o regard for prices is SOOOOO worth it!