Hello, Soon to be joining OW via US entering the Alliance. After having long used *A carriers for TATL flights, I'm looking at some options to go NYC-MUC-LON-NYC (not particular about airports in NYC or LON).

Flying in Y, so primarily seat comfort, lounges, onboard service, and help in terms of IRROPS. If things transfer as expected, I'm assuming I'll be a OW Sapphire as a US Gold. I'm looking at these flights, and just curious from an FTer/OWer perspective which would be better:

JFK-LHR-MUC on BA or AA/BA
JFK-MAD-MUC on IB
JFK-DUS-MUC on AB


On the return, most likely looking at BA or AA direct, and tempted to do BA just to try out the 787 into EWR.

As seasoned OW flyers which carrier would you go with. (they're all about within about $100 so price isn't a huge factor)

Thanks, and optimistically looking forward to joining OW! (while pining for all the great lost *A connections and carriers)