Your question is far more complex than how you asked it... and surely must be prefaced by time of the year and particular crappie feeding tendencies at a given time of day. I know it has always been my particular preference to Carolina rig using differing weighs and differing jigs or hook/minnow combinations. I also like to push or pull baits for the most part with the bait presented at various depths in the water column. The only type of dragging presentations that I personally make is when I am using a drop shot type rig where the weights remain in contact with the bottom or other structure features. There are other times however that I have found that when jig fishing... the crappies like a pause in the retrieve when the jig is allowed to fall to the bottom and then flutter back to life as it resumes the swimming action. There are other times when they prefer the bait changing directions or speeding up drastically which triggers the bite.