Which style results in the more highly-engaged employees? According to a study of 160,576 employees under the command 30,661 bosses, the tough-versus-nice battle is tight. Eight percent of tough-led employees are highly engaged. Nice? Six percent. So tough-minded leaders are the winner, right? Not so fast. The most effective leaders, it turns out, use both styles, and 68% percent — that's right, 68% — of their employees are highly engaged. Personally, I want to be a "driver" and an "enhancer!"