Business Class on LH is decades behind the competition, typicaly 2-2-2 configuraten (don't even start dreaming about suites with doors).
F on LH ist good but not great. F lounges in MUC, FRA and a few other airports are significantly better.
MUC is a very nice airport to connect (same as ZRH if that is an option on Swiss). I personally hate FRA.

There is a lot of additional information here, just do a search and scan thru some of the treads about this topic.