Based on what you have said one of the radar unit would be best. From what I understand they set up quick, no sky screens, but there might be interference from other shooter's bullets and they are not cheap. I have a PACT unit which is several years old. I was very happy with their stand alon Chrono, but the shot timer Chrono unit has been a pain in the butt for me. I have sent it back a number of times for bad Chrono readings and the start button going bad. Part of my problem is my gun club's lay out means I really can not run the Chrono unit the afternoon. I have had a Chrono for years. I don't pull it out often any more, but I can not imagine working up new loads with out one. I also can not image practicing any type of defense or competition drills with out a shot timer.