There is no one optimum leadership style.
We must think audience. Whom are we leading?
Good leadership can only be defined in its application context rather than a role model with an amazing suite of skills. Is good leadership the domain of the person or the situation?
Leadership incorporates two factors. The first one is you must know the audience you are leading and secondly, your leadership style which will very much depend on your personality type. For example, if you are leading a group of highly technical executives and began to motivate them by an enthusiastic, energetic, ebullience hyped presentation, then it is very likely that they would not be over reactive to this style of approach. Technical executives will react best to a more pragmatic approach, with less of the, what they consider to be, an unnecessary and over-emotive, artificial delivery.