second one for helical, only way to go in my book.
as far as 3 or 4 shoot what works best for you and your bow. Up until recentlyIi have been shooting 3, but my broadheads where always just a hair off field points. SoIi tried out 4 and it put them on spot with field points. I will probably go back to 3 for summer 3d shooting, 7 grains less weight so tad bit faster. I need all the help I can get!
Helical fletching keeps your broadhead spinning to prevent wind planing. Not important with a field point, but plenty important with blades on the front of the arrow that can act like wings.
Typically an arrow with helical fletch will group tighter than one without.
Thus QuickSpins' claim of getting tighter groups by producing more rotation of the arrow.
I shoot Blazers with Helical, as much as I can get on them and still keep them on the shaft.
Helical is best for accuracy with hunting arrows. The more helical the more the arrow will spin and stabilize in flight. Offset is better than straight as it will provide more spin but not as much as helical.