>>1863227With a buoyant plastic like a TRD, a ned head will stand on the bottom and present as a crawdad in defensive posture or a minnow feeding. You can get bites just dead sticking it. Whereas with a ballhead, you'll only get them on the fall or when you're imparting action into the lure. The hooks themselves are also generally sharper and better quality than what you get out of most ball jigs.
