My money's on the DeWalt.
There Can Be Only One: Power Drill Fight Club

This is a video of two cordless power attached to the same bit with their triggers zip-tied down doing battle on the floor of a construction site. According to the video’s creator: “We were on our 30 min lunch break and Andres started to talk about which drill was toughest so we decided to try our experiment.” And what an experiment it was! Now this is a textbook example of the scientific method at work if I’ve ever seen one. Somebody call the public school system, tell them we have a new mandatory science lesson.