I was always convinced for 35 years that the only grub tail designs that caught fish were curly tails or Sassy Shad tails. But a few years ago I accidentally found that other designs work better at really slow retrieves.
Looking at these tail design, you can see why any slight motion causes a quiver & roll fish can’t let go past:
Thin prong tail:
Split tail of the Crappie Magnet:
Cone tail:
and of course the thin straight tail: