Types of thinking: Strategic Thinking (Rational + Creative)

Strategic thinking merges aspects of both rational and creative thinking. It involves considering actions and decisions in the context of a big-picture view of an organization and its strategic goals, its broader business environement, and the interaction of all its divisions. This enables managers to identify and capitalize on opportunities for contributing to the overall success of their organizations, while making decisions for their departments and managing day-to-day business operations.

Are highly rational individuals more sucessful?

In my humble opinion, no. Here is why, I think a strong emotional quotient can matter more.
Successful people knows that the core of any achievement will depend on personal relationships.
The most successful people are frequently unreasonable people who refuse to give up, even when evidence and odds are very much against them. In conclusion, human skills are more important than cold rational logic.