I've trained at neither one, and I didn't know Yamasaki had a school in DC. I have visited Capital JJ, and from what I understand, none of the Gracie's have ever been there. They do have a nice framed picture, of Helio, though. I thought it was pretty lax, when I went there. I would go with Lloyd Irvin in Arlington. I took Muay Thai there, and I think it is the best place around the DC/Metro area. But check out the places for yourself, when you get here.