Is there a big difference between the two?  I've fished them both but not enough to notice any differences or advantages one way or the other, but I know some who only throw shakeyheads with the free moving screw lock clipped to the eye of the hook or just between the eye and jighead.  Should I rig my shakeyheads this way in certain situations vs. the screw lock that's casted in the jighead? 

 

I'm probably over-analyzing here, but that's what I do when cabin fever sets in. 

The clip on type is less likely to deflect the hook set like the molded in type will.

 

  I've fished them both but not enough to notice any differences or advantages one way or the other

 

I'm with you.

 

oe