Flight
This is the main airport for Puerto Rico and it has the most direct flights, which tends to be cheaper than flying to BQN. The downside is it is 2 hours away from the venue. However San Juan has most of the well know tourist attractions and more selections for rental cars and excursions.
Flight
BQN is in the West Side of the island and it's closer to the venue in Aguada. You usually have to make a layover somewhere before you get to BQN.