1. I disagree slightly with Mob....yes feathers can technically be called faster......but you'll never see the difference out of the bow and down range feathers will slow an arrow much quicker due to wind drag. Will you see a difference in arrow performance...no in the fractions of seconds that arrows are measured, fps...it's really a mute point as which is faster.

2. Accuracy...no neither is more accurate....to a point, again. Both feathers and vanes can be dead on accurate with tuning...so if both can hit dead on...it's really a matter of acher accuracy rather than equipment. That being said, feathers do have more air drag and will stabilize an arrow quicker.... which in turn makes tuning broadheads easier. The sooner you get an arrow spinning out of a bow, the quicker it will stabilize flight.

3.Straight vs helical/or offset. Again, see the rule above. The quicker you get an arrow spinning out of a bow, the sooner it will stabilize. Helical helps the arrow to spin sooner out of the bow which in turn will stabilize flaws in arrow flight such as broadhead misallignment, larger fixed blades with may fight the fletch and try to steer the arrow. Offset as well will stabilze an arrow quicker.

4. The weight difference is marginal and it comes into play only when marginal FOC calculations occur. If your having arrow flight problems and all else is equal, well tuned bow, arrow to match...FOC might be an issue.

5. Color makes no difference as it relates to speed. BUT, I do recommend bright fletch for varies reason...to watch arrow flight and recognize flaws, to see the arrow in the animal to mark the wound sight(important in recover timing), to see the arrow on the ground afterward. (again, animal recovery).

The biggest factor in feathers vs vanes are durability and noise. Feathers can be noisier and of course the durability in them coming apart and weather issues.

I prefer vanes after many seasons of feather usage. I used feathers for tuning flaws but today with matched equipment and technology I eliminate those tuning flaws and use vanes for durability.