Which is better? thermite made from plaster powder and powder aluminium or iron oxide and powder aluminium?

This person is something of an expert on thermite, he's done a lot of work on the various compositions of thermite, and their uses.





http://www.youtube.com/watch?v=BE_tuWKsB鈥?/a>Which is better? thermite made from plaster powder and powder aluminium or iron oxide and powder aluminium?
I've only seen it made from iron oxide and alum powder. It is easy to get the ingredients. I've heard of making the iron oxide by soaking rusty nails and then using a coffee filter.





http://www.youtube.com/watch?v=aOPOaeooT鈥?/a>