All airs and down and up B are cool. The most powerfull are up b, down b, nair and bair. I know depends of the DI, but without DI, nair is better to fast kill than down b? I love the down b and I'm testing nair like Boss like to use. Uair is just when opponent is 175% or more to easy kill. Well, witch one is the "killer", Nair or Down B? Thanks.