Swf Decompiler - Which Ones Best (not using to steal code)

The company I work for is starting to think about letting outside employees use some of our Flash training deliverables. I’m currently working on encrypting are swfs to deter others from decompiling it. Currently I have a limited budget and can only get one decompiler to use for testing.

The main ones I see our there is Sothink and Eltima, anyone have any input to help my decision on which one to get?