It is all about leverage. Pretty much all the pullers I've seen use the same thread pitch on the threaded section that does the work so a revolution moves the crank arm about the same distance meaning it will take about the same force. If you found one with finer threading (more threads per inch), it would take less torque to do its work. I've had a couple of cranks that were on much tighter than normal and took a lot more effort to remove. Doubt a different puller would have made a significant difference.