I think it would be useful to have a list of scenarios, which can be used to evaluate the performance of various methods of selecting a winner. For each scenario, there should be almost unanimous agreement on the best choice, and the methods will need to be able to make the correct selection. In some situations, there may be two or more outcomes that are pretty much equally desired by the voters.
For example, in Alex Gendler's TED-Ed video, https://youtu.be/PaxVCsnox_4, it seems to me that everyone will agree that North base is the spaceport location that will result in the greatest amount of satisfaction for the greatest number of people.
If I'm correct, about the nearly unanimous agreement, then methods can be compared based on how well they do with a variety of scenarios with an established best outcome consensus.
If I'm wrong, and people cannot agree on what the best choice is, then it seems to me that our quest to find a method is striving to achieve the impossible.