People's decisions are informed by their economical background, the financial behaviour and communication patterns of parents, priorities of parents, experience, self-discipline, approach to risk taking, planning, and advice. Since each person's family is so different, given the same information, the response will be drastically different. This is why people need to talk. With most couples, one person usually takes over control of finances to the relief of the other person. It's usually the woman if their ethnic backgrounds permit this
They have different priorities.
They have different goals.
Simple we are not robots programmed to think alike nor are any two of us the same so we all think differently as it should be or the world would be awfully boring and many other factors come into play here why two people given the exact data come up with two different answers and that's why there usually is no right or wrong answers to many of lifes questions and sometimes there isn't even a definite answer