Spiral fletches are much better if u can get them to fly through your rest. If your shooting fixed blade broadheads, helical fletching makes the arrow more stable and accurate, especially at longer ranges. Feathers will also make it easier for rest clearence cause its not as critical if a feather hits the rest compared to a vane. SO, if u can, yes get helical flethcing, or atleast an offset. If your shooting mechanicals its not as big of deal but i still recomend it.