You're both right........
Feathers are faster within the first 40-50 yards and then are overtaken by vanes due to their increased drag.
Don't get all cute on me
Feathers are faster......period.
Vanes will NOT overtake a feather fletch at 40 or 50 yds. At yardages a little farther than that they may be faster - but to "overtake" the feather it will take a bit more yardage - well out of the "hunting Zone".
And......even if they are flying faster at 50 yds they will not hit the target first
they gots somes catchings ups to do