Do J. You care about value for miles and J is better value than F, especially on a east coast TATL with connection to Europe (indeed CE). You can also do outbound in J (since all you will do is sleep) and inbound in F so you can do CCR and enjoy the day flight. That almost makes F worth it.

Plenty of topics on this matter though. On average about 2 are started each week, but this week has been especially fruitful.