If you want GS definitely fly UA metal if you don't have other Int'l trips coming up this year. Best experience would be connecting onto OS but given us GS considerations I'd connect in MUC. Great SEN lounge there (with delicious hot entrees) plus, and I can't believe no one's mentioned this, I much prefer the 763 BF to 772 or 787 if you can snag seat 1D! Bulkhead has great legroom and it's so awesome to have aisle access from both sides!