The best way to always have the last word in an argument........is to say sorry!
Best advice i can give, married 10 years inAugust and although we have had fights, they have always been about something that matters.
I drive my wife mad because she will ask me what i want to do, and i will almost always reply "whatever........." That sounds lazy, but if my wife and my 2 girls are happy, then so am i.
Good luck on the future, you have to work at it and never take each other for granted, but sounds to me like that won't be a problem.