What do you consider the most important difference between transformational leadership and transactional leadership? Between transformational and charismatic leadership?

How is transformational leadership similar to charismatic leadership?

  Assume you are on a search committee to replace the CEO of a large financial services firm that is recovering from problems related to the mortgage crisis. 

Which do you think would be most valuable for a new top leader trying to solve the problems within the organization—charismatic, transformational, coalitional, or Machiavellian-style leadership? 

What about for a new top leader of a small private university? Discuss.