Hmmmm….. Everyone seems so in tune with themselves, I hate to throw another choice out there…
But 4 fletch works well too. I use a 60 deg 120 deg orientation. I set my nocks so the string splits the 60 deg angle.
I feel I get better arrow flight with 4 fletch. Not sure how much better. But what I like is not having to orient my arrow when I put it on the string. I just stick it on and it’s the same either way. No orientation required. 8)
The other advantage, is that the feathers share wear. Since the arrow is going on the string with the feathers oriented against the bow or away from the bow 50% of the time.