What teaches more about leadership, schools (such as Ranger) or time as an NCO (in a leadership position)?

I would lean towards time in position. Schools are a tool to use. Sometimes they fit, sometimes they don't. It takes the Soldier to know how to apply what has been learned and in what manner to do so.

I've always said, there's a book answer, the way to do things, and the way to get things done. Not many schools prepare you for the latter. That comes with time and experience.

70% is learned by doing the job, 20% from a mentor or learning from others, and 10% is from school. Otherwise, we all can go to school and get rich. School will give you a knowledge base . But, to learn you must apply what you know from all your experiences.

WO1 (Join to see) Leadership schools provide good information. Listening and observing the best practices of respected leaders, and then incorporating some of these practices into your leadership style, will be a key component. Lastly, time in grade as a NCO will gain you the needed experience. Learn from your mistakes, and do not make the same mistake twice.