Thanks stealthferret for posting this as Miss FT2E are in the same situation/dilemma for our honeymoon next year.

Our thinking so far (and supported by a number of the posts above) is to go F on the outbound flight, to enjoy the whole experience, then J coming back when all we want to do is sleep.

This is however coming from a couple who have never been anywhere else except economy, so pretty much anything is going to "wow" us