Depends on your criteria. To fly obscure international carriers to less traveled cities the answer is JFK. If you live in Queens, B'lyn, LI or some points in CT, JFK closer.
To fly to more mainstream European capitals and domestically without stopping in a hub, live in NJ, PA or Manhattan then it is EWR.
EWR served more pax last year than JFK, not sure how it will pan out this year, but would guess because of recent events and the sharp decline in int'l traffic, EWR with its stronger domestic network, will remain on top.
EWR is catching up with the rest of the world airports in shopping and food...it will get there, if the construction ever completes.
For me, EWR is the best...CAL lives there.