If you are able to fly the return leg from FRA, then flying LH is a no brainer. They have a superb hard product, and the First Class Terminal is really special. Love the car transfer from the lounge to the plane! Given a choice of any F product, its hard for me to go past SQ, although LH, CX and EK are all good for different reasons as well. I know there are a lot of QF F lovers here, but I've never been compelled to pay dollars for it, and would only fly on upgrades or the odd FASA in days gone by. However, I've gladly forked over good money for F on SQ, LH and CX in the past and have never been disappointed. I can thank my wife and her EK redemptions for our F experiences on the a380, although apart from the shower suite, I'm not sure I would pay to fly them over the other alternatives.