Xiao Wang's is excellent. The quality of the duck (particularly the crispiness of the skin) and pancakes in uniformly excellent in Beijing, but I can't get over just how sweat the Hoisin sauce is. Maybe it's my relatively uneducated American pallate, but I just prefer the hoisin sauce you get at top quality restaurants in the US and UK. Take Beijing duck and pancakes, and US hoisin sauce, and I think I'd die of a heart attack next week.