About to pull the trigger on some RRS gear. I see they have options as to which handle on the TA-3 leveling base, 2.5", 4.5", or low-profile knob. Pros/cons? Also, in actual use the locking collar on the TA-U, which is mounted above the legs, looks like it would be easier to run than reaching between the down and in between the tripod legs for the above handle types.? Is that the case, or no?