What’s an A/B test you’ve performed that surprised you and why?

I have performed A/B testing at work in hopes to get a better sense at the best way to approach people as a foreman standpoint. I first chose a freindly approach and worked alongside my crew. Then for the second I took role of charge and provided a task that was availible on the jobsite. After a week or so of trying each and seeing how my crew worked best I decided that working alongside my crew worked much better because when they had questions I was already there to answer them. I also learned fast that a few older men on my crew lacked appretiation for any type of authority and did not like being pushed in any direction. I found working as a team to get taskes done in order worked much better.