Well Tim, the difference between Premo and Sculpey you will see mainly after a baking. If the last one is a fragile - it's easy to break it or if the figure is falling down from the shelf it will be guaranteed broken in some places. On the opposite side Premo - it becomes elastic after a baking so you can even bent a thin plate of Premo. So the figures of Premo have a better chances to live longer. Then Premo for me is better a little bit in all aspects of sculptin' process - from the first touch to the very smooth end. Ang even if you need to cut or drill it after a baking, the cut will have more accurate edges again.