Fr. Mike says the best way to make decisions together is to distinguish between preferences and principles.
If the reason you’re favoring a choice is a matter of principle, it is your duty to lead the other person in that decision to the truth of that principle.
If the choice you’re favoring is just a matter of preference though, charity suggests that you default to the preference of the beloved one involved in the decision instead.
Fr. Mike uses going to church as an example. It is a matter of principle that we have to go to Sunday Mass and worship God the way he tells us to, so if someone tells us going to a Catholic Mass is just our preference we can tell them as a matter of fact it’s not. However, if the issue is which church we go to for Sunday Mass, say St. Francis’ Church or St. Andrew’s, more often than not that is just a matter of preference.
For a helpful book on making decisions, check out Pray, Decide, and Don’t Worry by Jackie and Bobby Angel, with Fr. Mike.