That is a tough question, but forming a great team is putting individuals together that are good at their roles, communication and other skills. I don’t think it’s sometimes good to put the people you have a good relationship with because it could cost problems in the long run for the team. I would try to get someone new and fresh mix with experience so the ideas will be new or updated.
To piggy back that it often trues sometimes you are just put on a team with people you may not get along with. If I was just put on a team you do not let the relationship with others affect you and just focus on the project at hand. As you listed below sometimes way to manage conflict and disagreement are all those, but what if we had to only pick one which one would you choose from the list above?