The JFK or EWR decision is complex and varies from person to person. It's a combination of location, overall airport facilities, and specific features, like clubs and PreCheck.

The location question is sometimes covered in the New York City forum. That, in itself, is complex. From Manhattan, I tend to favor JFK but from Wall Street, EWR can be ok. For the absolute cheapskate, JFK is potentially the cheapest if one takes the subway and the Q10 bus because it's $2.75. 20 years ago, JFK used to be harder to get to so EWR was better from some parts of Manhattan.

I tend to like JFK Terminal 7 slightly more than EWR Terminal A. Food is about the same but I'd rank JFK 1% higher. I find the JFK Terminal much more relaxing than the crowded concourse at EWR. You can stroll around nearby gates, see empty gates or maybe a British Airways plane.