From what I've read and been told by those that shoot feathers, feathers create more drag given the same # of fletchings. This straightens out the arrow flight faster and is a slight advantage for broadhead flight. Also, if the fletching contacts anything, the feather gives more than vanes, and will deflect less(more forgiving). The draw back is that the arrow slows quicker and dropps more beyond 50 yards, or so. In a well tuned/ fast shooting bow, broadhead flight isn't usually an issue except for user error
of which I've been guilty. I prefer Blazer 2" vanes. I've had no problems with them sticking. I use Goat Tough glue.