What is more accurate , the fozgometer or the diplay of the oscilloscoop

Would like to know sure about the azimuth of the cartridge ,a visual check first ,than the result of the fozgo , just a bit differance between the left and right channel , than both channels in mono , green led and a little shiny of the red led for the right side .Than looking at the display of my techtronix dual beam oscilloscoop , both channels 
even , no differance in amplitude . Playing a piece of music , perfect ! What is true ? Can you adjust your cartridge with the fozgo with results in the description ? Ofcourse I did the calibration of the fozgo.