With little kids, I would totally recommend AKV, either Jambo or Kidani. Honestly, at that age, you don't want to plan on spending all your time in the parks. Yes, BLT and VWL are better for location to MK, but AKV is a destination in itself. It really feels like a visit to another world.
Even if you don't get savannah view, there are places to view the animals all over the place. Plus, there are multiple really good restaurants in the resort. Boma is a great destination for a large group, and we've found that everyone can generally find something on the buffet that they enjoy, even if they are picky eaters. (And adventurous eaters love the African influence.) Sanaa has a great view of the savannah, so our kids will put up with the relaxing sit down meal.
If your weather is good, the pools are great at AKV. My son loves watching the movies in the pool, then going over to look at nearby animals, then climbing back in the pool. Both the Kidani and Jambo pools are zero entry and great. I don't know think the wonderful play area in the Kidani pool is open when it's cold, but when it is open, it is my son's favorite of all the resorts. (He loves BCV, too.)
Honestly, AKV has been my son's favorite since his first trip. Even when we aren't staying there, we have to plan at least one meal there, because my son wants to visit it.