Smaller fletching works well for a target or 3D setup, assuming the bow is tuned decently. For hunting, when you stick broadheads on the front, those blades act like little wings trying to steer the front of the arrow. To counter this and add better control longer fletch is needed. The standard used to be 4" vanes or even better, 4" feathers.

The last few years 2" vanes such as Blazers have become popular. Thesee work almost as well as 4" vanes because they are stiffer and have a higher profile which, depending on the bow setup, may or may not be beneficial. Most times a drop away rest is required and more cable offset to give good clearance at the cables.

Each has pros and cons and I would suggest trying some of each to see which suits your favor.