Just got back from a split stay, four days at yc concierge and four days at poly concierge. I had stayed poly before and decided to go with it again just in case yc was not to our liking. All I can say is the yc was awesome. The personal service blew the poly staff away. In the few days we were there, they knew the comings and goings of my family. I would come up from the escalator and they would tell me that my wife just stepped out for a moment, or something like that. The lounge was never crowded and the food was abundant and tasty. I didn't have a bad time at the poly, but yc was just outstanding. I still want to try bwi concierge, but my new favorite is definately yc. I can not say enough good things about the entire staff of the hotel, not just the concierge staff. But the concierge staff just blew me away for friendliness. Head and shoulders above the poly.