We're not talking about an automobile here. We're talking about morality. How can your moral preferences logically be truer than mine without the existence of a universal moral standard? They can't. By extension, then, good and evil become preferences as well.
Sounds like a trick question to me. After all, in the context of the question, what does "truer" mean except closer to a "universal moral standard"?
Do they promote my survival and the survival of my progeny? Morality which stresses cooperation will do such. Morality which stresses "every man for himself" does not. If I and my progeny do not survive, neither will our morality; therefore only morality which promotes survival will survive.
If your goal is to get to heaven, then by all means you must follow revealed morality. That is between you and God
If your goal is a pleasant, just, stable and productive society, you need morality codified into laws and traditions. These may use your revealed morality as a starting point, but the details are invented. And more to the point, unless you care to kill everyone you doesn't share your religion, then laws and traditions are going to be compromises. Again, invented.