Just out of choice and also why not spoil yourselves I would go F both ways. Do the morning flight out of JFK, so that you can enjoy the complete experience of the day flight, and then when you return back to JFK do a flight around 13.00 then you will be able to enjoy the CCR, have yourselves a massage, and then have a meal, the perfect way to start the day off before getting on the flight, and then enjoy all the niceties of the F experience going back. Whatever you choose have a great trip.^