Leadership style and Company culture
There are many leadership styles. Not only those listed in theory (autocratic,charismatic,bureaucratic,laissez-faire, etc.), but also their various combinations. The leadership style comes out of the individual personality and so each leader has a style of his/her own. Effectiveness of a particular style cannot be evaluated for the style itself, but only when considering a specific environment (in which the style si applied) - e.g. a specific company culture.