Hello. Hard to say since you did not say which models are you comparing.
Boeing is usually overshooting design (used to make slightly heavier a/c in order to have more "margin of safety" in its structure = room for derivatives).
Airbus, more or less, goes for more precise "zero margin" approach. That asks for some skills when you want to go and certify a derivative that will carry more payload (passengers, cargo).
Cheers,