I'm visiting Japan for the 11th time but have been told by a family member there that the Friendly Airport Limousine no longer serves Shinagawa. I can switch to HND on the return to BWI but lose 2.5 hours en route. My question is, how easy is it to hop the NRT train from Shinagawa with one large suitcase each plus a backpack? My wife and I have never tried the train from Shinagawa to NRT but are willing to try it at least on arrival, maybe not on our return home due to a schedule change allowing a free change to our return flight. For now, we fly back out of HND and could take the Friendly Airport Limo bus, which my wife thinks is easier.
I'm Star Alliance Gold and I wonder if the premium airport lounge is significantly better at HND vs NRT? That might have some weight in my decision of which airport to depart Japan from.