I'm currently booked on an UA flight to Europe in First Class. Space just opened up for a LH flight in First Class for an additional 30k miles + a $100 change fee. Is this worth it? Is there a huge difference between UA and LH First class? This will be my first First Class long haul experience.
I would, if you're arriving in FRA and have a decent layover you can still take advantage of the FC arrival options there.