I guess it depends on your family style of eating and desire to get things done w/o scheduled meals.
I did the dining plan with the table service meals in '06. While it was a great trip, and my son was thrilled with the daily character meals, when I look back, we were slaves to our ressies. Be at a certain park on a certain day to wait for a ressie and have a full sit down meal. Nice, but time consuming.
We leave in a couple hours for our trip (hence me being up at 3:30am--who can sleep before a trip?) and I chose the quick service because I want the freedom to eat where we want, when we want.
For us, we aren't used to fancy meals or even large meals every night, so something quick service is fine for us, and my son is 8 and would rather spend the time riding than waiting for a long sit down meal. We're paying OOP for one TS meal, and that's Chef Mickey's for breakfast b/c we were unable to get a ressie there last time we went, and I wanted to have one 'fun' meal for my kiddo while he's still a believer, lol!
I think both plans have their advantages and disadvantages, and it comes down to what your family will be happier with.
Happy planning!