I'd have to say Yacht Club. We have not been to BWI concierge but I have heard wonderful things about it.
We had room 5229 last year at YC Concierge and it was perfect.
I would also suggest a garden suite at BWI if they still come with concierge service. (your 7 yr. old might not like being far from the concierge lounge.)
I've stayed at teh BWI and YC in concierge, and MUCH prefered the BWI. With a seven year old, I'd look closely at the BC, I think it's the most "kid friendly" of the three.
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