The RRS TA-3 leveling head comes with the choice of three different handles. You get to choose one out of the three choices of short handle 2.5", long handle with hook 4.5" , or a knob. These are the handles you twist to lock/unlock the base. I will be using this with a tripod setup for shooting a 15# to 20# rifle standing and sitting positions. Anyone out there with experience with any of theses choices? What is best and why? Thanks