My opinion is only based on what I have researched - I am still in the trip planning mode - but I would consider concierge because of the food offerings. I think the upgrade is around $70/night (don't quote me on that!) and when I think of the amount of $$ my family would spend on breakfast, snacks, and a couple of drinks for the adults, it is worth it to upgrade and get free food. From what I understand you can also take some bottled water, snacks etc. (within reason I'm sure) from the concierge lounge to the Parks. Either way I'm sure you and your family will have an awesome time - I have heard great things about AKL.
Oh, one more thing, we want to go concierge with AKL also because of the Sunrise Safari which is only for concierge guests. It does cost extra (approx $50/person), but you get to go through the Safari in a private truck with (I think) a max of 20 people and you get a huge brunch afterwords. Apparently the tour is approx 45 mins and they stop and let you take pics and explain about the animals etc. This is only available if you are concierge.