Far be it for me to disagree with Ferguson or OL, but....
Neither are right or wrong, just different tests for different results. Rough tune and fine tune.
strip all the feathers/vanes off, and then shoot
if they fly nock right, they're too stiff, nock left, too weak
if too stiff, shoot longer shafts or heavier points
if too weak, reduce tip weight or shorten shaft
Best to find out if your arrows are grossly overspined or underspined. It'll get you in the ballpark and help you zero in on a few different arrow setups.
OL says to watch in flight or point of impact compared to fletched arrows.
Shoot thosearrow setups thatshot best in the other testand use this method to figure out which is best.
Remember, to retest if/when you change your brace height, change string materials or switch back and forth from field points to broadheads.