I can tell you that the scented lures work well for me. I started using them approximately 2 years ago and have used very few other lures due to their effectiveness. (Disclaimer: I maintain a website for the originator of Slab Buster Crappie jigs. However, I have no financial interest or gain any profit from the sale of any jig).
The scented jig is effective for me, but I am not sure that I can cite the reason. They either like the scent and become more aggressive, or the scent of the jig simply removes the human scent. Either way I am happy with the results.
Mike
"Jackpot"