As stated you don’t usually get to choose. That being said, I think you need to lean on the knowledge vs compatibility side. For the sake of giving percentages, let’s say 70/30. You can people who have great relationships but if they don’t know anything whats the point. You wouldn’t be able to get anything done, but you’d agree on it. On the flip side, you need to have some compatibility or no middle ground can be reached and the project falls apart. The threat of losing your job is not always enough motivation, or at the very least it’s a minimal incentive. A balance is needed in order for the team to function effectively.