Posting in the AS forum because I’m flying AS, and your JFK experience can vary greatly by terminal.
Flight is at 9am on a Wednesday. Flying F and have TSA Pre. Staying at an airport hotel the night before. Things I care about, in order: 1) departing on time. 2) Sleeping in, arriving at the airport as late as possible, and getting through security fast as possible. 3) Overall In-flight experience (example, Airbus with Viasat > Older 737 with GoGo).
Any suggestions based on personal experiences?
JFK T7 - TSA Pre doesn't always operate. You could get Pre-light (with a line, but not horrible line). Lounge is a pleasant space, should you end up with time. Terminal otherwise is not very exciting (especially by the AS gates) but is Taj Majal-like in comparison with EWR.
EWR - It has been a while since I've been in that decrepit dump, but the AS gates are just atrocious, the security lines aren't the best, and if they've dusted or mopped the floor since I've been there, it could only be to the detriment of the terminal.
All that said, if I could be guaranteed a non-reconfigured Airbus with a functional F seat, there's a lot of appeal to that. But no one will guarantee you that.