I think Paddock would be the best overall area. It has the best feature pool area for kids, has a quick Food area (with refills) and is the 3rd bus stop.
(Park busses go to Grandstand, Carousel, Paddock, Congress Park, then Springs. At times bus seats are full by the time they get to Congress Park)
On the DVC side, Springs and Congress Park have the “preferred” designation, so you may not get those on a cash reservation.
http://www.wdwinfo.com/resortmaps/Saratoga.htm
The “main” area is the Springs. (And has the other QS, TS)
2 Grandstand buildings are closer to the main areas than the actual Springs buildings. Grandstand also has a pool bar w/refills (no food) and a splash area, but a basic pool. As the 1st bus stop and close to main areas, I really like Grandstand, too.
Congress Park has great DS views and is the quickest walk to DS.
Carousel is close to the Paddock pool, and is the fastest drive out if you have a car.