Two things stand out to me as being functionally different between the curved clip point and the simple drop point, as seen in the examples shown at the start of this thread. First is the difference in degrees that the angles of the tip are, with the curved clip point tip being significantly fewer degrees then the drop point tip, making for a more pointy and sharp tip on the curved clip point. The second thing that stands out is the amount of metal above and behind the tip of both knives, with the curved clip point having far less then the drop point, which would mean less "excess/non sharpened" metal that had to be shoved into the object when stabbing. The narrower tip and the less metal above and behind it would result in the curved clip point stabbing at the same depth with less force required then the drop point, in my opinion, because the drop point will have more of a wedging effect due to its shape. The drop point would have a stronger tip, and would weigh more, both which would make it be better suited at chopping and hard use applications where tip breakage might occur.