That's kind of a quandary. The P/G view villas that are closest to the single bank of elevators, as well as closest to the Epcot side, are the ones with a view of Luna Park, the feature pool. We had a 2BR there once, and the afternoon activities at the pool made it pretty much impossible for us to take an afternoon nap. OTOH, on that same trip our DS had a studio with a Village Green view and was directly above the breezeway that everyone walks through between the elevators on one end and the Village Green/Boardwalk/walkway to Epcot on the other end, and he said it was noisy at night. The BW view villas (booking category) can be noisy at night too, but we haven't had noise problems when on a high floor - the trouble with those is that the 2BR are way down the hallway, closer to Jellyrolls, because the GV come first!
Looking at the map linked below, you might request View of Croquet Court, which would probably be the quietest but will be at the very far end of the BW-facing wing. So not necessarily close to the Epcot walkway.
IOW, you'll have to decide what's most important! If you need quiet, request View of Quiet Pool. It's a longer walk to the elevators and to Epcot, but the small kids should be able to rest better both in the afternoon and at night.
https://www.wdwinfo.com/maps/BoardWalkMap.pdf