Motion offense is a slow paced strategy that relies on passing. I would look at my opponents assist / turnover ratio. If his team gives up many turnovers , I put my best handling players on the floor. If my team is very good, man to man is enough. If I need to improve my outside defense, a 3-2 or 1-3-1 will disrupt his offensive flow. Since he shoots from outside, you can also focus on your rebounding to get more shots than he does. First thing , put your best handling on the floor.