The one that performs best in your barrel. Each barrel shoots each ammo type and brand a little differently than the next barrel. This is true of slug groups and shot patterns. All of our choke tubes are marked with the type of pattern that each tube should produce, but consider the information more of a guide than a rule. Shot patterns from identically marked tubes may vary by load and ammo brand. For better shooting scores, know your equipment and its capabilities. Range test your shotgun before heading to the field.