many wonder if the final word should be the leader's. being a leader does not mean being a boss or a person who controls a group. on the other hand, being authoritarian and make decisions does not always mean that the leader is being selfish and practising repression against the followers.
every situation is unique. being autocratic (having the last word in team) can be necessary in some cases; when a decision has to be made urgently for example. however, the conditions that requires an autocratic leadership are rare usually.
there are many leaders say that authoritarian leadership is suitable when the team member are new employees who are motivated to learn. I would argue that even new employees have critical thinking skills and thier unique understanding of the world. it is not fair to judge a person's ability to make a judgement based on him being new employee.
I personally prefer the participative style where everybody contribute to the decision. it involves sharing information with all members and engage their perspective, understanding and suggestions in the decision made which will make this decision more robust . however, even in this style and in any other style the decision is valid only when the leader authorise it.