I am participating solo. I didn't realise there was even a thing about people taking part in teams. I am sure taking part as a team is great for sharing the workload and being able to bounce ideas, but when you have clear ideas about what you definitely want to, there would be the risk of having to compromise over them.
I have only had one creative collaboration work well, where it was not accepted that either the other person or myself was in charge. They came up with the overall idea, which would not have happened without them, but I did over 90% of the writing. Even then there was some disagreements on how the adventure was to end, which was resolved by the other person finding they no longer had the time to put into the project.