You can win an argument especially if you are right and got proofs.
Yet, it is not advisable to win an argument at all cost because you might win the argument to loose your personality or a long time friendship or a coming help! The best way to win an argument is to avoid it. It’s better to discuss rather than argue.
You can even play the dumb in your discussion to avoid it turning to arguments though you know much better and so sure the other person is wrong. To be at peace is far better than winning an argument.