Both of those DVC units are pretty far from the Magic Kingdom and far from Epcot. Saratoga Springs is the old Disney Village (or Institute) and it's the furthest from anything. I don't know how old your kids are, so it's hard for me to guess where you'd want to spend most of your time.

The best DVC units near parks are in this order:
Bay Lake Tower at the Contemporary resort (walk to the MK)
Wilderness Villas at the Wilderness Lodge (boat to the MK)
Beach Club Villas at the Beach Club (walk to Epcot)
Boardwalk Villas at the Boardwalk (walk to Epcot)
All others with the units at the Animal Kingdom and Saratoga Springs being the furthest from anything (except the Animal Kingdom)

There are also Cabins at Ft. Wilderness with full kitchens. Actually, they're more like having your own home. It's fully detached, has a deck, picnic table, and grill. You pull up to it to park. We've stayed there several times and enjoyed the heck out of it, since there's so much to do at Ft. Wilderness. There's also a boat that takes you to the MK. They are also substantially less expensive than the DVC units.

If you decide on any of the units with kitchens, I have a great grocery delivery service you can use. Send them your list, and they deliver on the day and time you'd like. It's more like a personal shopping service and the delivery fee is based on how much you spend and is reasonable.