Based on McGregor's Theory, we would assume that Theory X managers are more effective in motivating people because they believe that their subordinates like work and are self-motivated and are willing to accept responsibility.

Theory X

The assumption that people dislike work, lack ambition, act irresponsibly, and prefer to be led.

Motivating

The process of stimulating someone's interest or enthusiasm for doing something.

Responsibility

The state or fact of having a duty to deal with something or of having control over someone; the state of being accountable.