Mentality really plays a part. I usually use 451V or 442 ND with normal mentality. I met this opponent (same Q) who play 4231 in CL semi. I drew 0-0 at his place by playing 451V with normal mentality. At home, he switched to overly aggressive 3-3W-3AW-1. I play my usual normal mentality 451V and paid the price. Lost 3-0 at home. Should have played def and counter. I think if oppo has 5-6 or more players in your half, better to play with def counter than anything else. Agreed?