JFK gives you straightforward public transit options. You can take the AirTrain people-mover to the Sutphin Blvd subway station, and then it's a straight shot on the J/Z line to Flushing Av (J) or Myrtle Av (Z) which are within a few blocks of your destination. Total cost $7.75 per person.
From LGA, you could take one of several buses and connect to the M train, which eventually stops at Flushing Av. That costs $2.75. Some people might find buses harder to navigate than AirTrain, and they're subject to road traffic.
From EWR, you have a monorail, then a train ride, followed by a subway journey with at least one transfer, and it will be closer to $15 per person.