This is a hot topic on the boards and you are going to get many differing opinions. If you are set on a plan, I'd say the regular one, the deluxe plan is a lot of food and the quick service plan is a waste of money. There are so many factors to take into account, as others have said how does your family eat? Are they big supper eaters including soft drinks and a dessert or medium eaters. Are you going for saving money or just the ease of not having to worry about it? Personally, I don't think the plan is worth it but that is because #1, we don't do character meals or buffets, #2 we are not price lookers on menus, #3 people who do the plans tend to try to "maximize their plan" i.e. order the most expensive thing on the menu, sometimes you might not be in a steak mood but would rather have a grilled chicken. Some people prefer appetizers to desserts, those are not included on the plan so you have to factor that in. Some people just want to snack around World Showcase for a meal, unless you eat at a signature restaurant and use 2 credits, you are losing a credit that way. There are many things to factor in. I always recommend going and looking at the menus of the places you are interested in and honestly look at what looks good to you, prices aside. Then add it all up, would that fit into the cost of the dining plan and how you eat? Don't use the dining plan calculators, they are averages and don't really do a good job.
I have a grown son, we've used the plan in the past but have found it just isn't convenient for us, we don't always want a TS every day. I'm a very small person and don't eat alot, I rarely eat snacks and don't ever eat between meals. Normally I'll get a kids meals at a QS for both breakfast and lunch, not because I'm trying to save money but because even they sometimes have more food than I eat. For supper I tend to order an appetizer and a salad, maybe a dessert to share with my son. We both drink adult beverages which are not included on the plan and I don't drink anything other than water if I'm not drinking an adult beverage. He does tend to like his coke sometimes at meals. My son will order an entre at a TS but normally prefers and appetizer to a dessert. Again, he is not huge on snacking between meals either. We love to go around WS and just grab snacks here and there at the different countries for our meals, this will be out meals sometime for lunch, sometimes for supper. We don't make ADRs in advance, they really are a whim thing for us, we might be walking around and at about 1 decide we want a TS meal that night, we have PHs so any park and any time is fine, the meal plans don't tend to work with that.