I love Nobu 57 for mochis and people watching. The food is incredible and consistent. Since the Nobu on 57th Street is on my block, it's very hard to resist. I go there at least once a week. The vibe is definitely different than the downtown location, not quite as funky and eclectic, yet it still offers excellent food and great ambiance. I personally prefer the 57th Street location (but maybe I'm biased since it's in my hood!).