What should I make my mold out of?

Hello! I’m just starting to get in to prosthetic making and finally have the budget to invest in silicone. I have made flat molds at school before, but this time I would like to make a face prosthetic. I have made my sculpt (cat nose) from monster clay on a mannequin and made a wall around it out of clay as well. I have release agent spray, syncap and plastik-10+deadened to make the prosthetic. My question is should I make the mold from platsil-25, plaster or something else like polyurethane? 
Thanks so much for this website and general knowledge sharing it’s fantastic and appreciated!! 
Best 
Nat

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