This is an important question in marketing and advertising these days.
There is an abundance of very similar 'things' in lots of markets, with similar excellent performances, similar big value for money.
If everything has a shine of perfection, chosing is not easy. That's why the "why should I buy it form you-question" needs a clear and single minded answer.
What did you mean to me lately? Is it your opinion I agree with? Is it your attitude that flatters me?