i d definitely choose F when flying to asia/australia as airlines are stunning (SQ, CX, TG, QF, EY, EK etc) - the below comments of others are sooo true
flying alone is fun in F as both ground staff and air hostess are your companions - so you never get bored.
i like the buggie drives in BKK, SIN or IST and real champagne there too
going through atlantic I d definitelty take SQ or LX in F. Others are not really worth it
I m not fond of C on LH (747), F on LX (340), F on TG (747). The planes are worn out and you feel like on an old boat
again, these are my very personal opinions and the choice is all yours