Yes, I believe there are different PM styles, just as there are different leadership styles. Those differing styles are shaped by many things, including: the individual experiences of the PM; observations they have made of other PMs in action; and the reward system of the business culture. Just as with leadership styles however, there is no one best style. The most effective PM's are situationally and emotionally aware and adapt their style to be most appropriate for the situation. Some situations require a command and control approach, others require a more collaborative style.