LOL. Not trying to geek out on you but the RI NYC Big Muff Pi's are Silicone (and then there is the infamous Op-Amp version which was used besides transistors). The Dunlop Fuzz Face uses the original Germanium PNP transistor. So basically they are going to be completely different sounds. However there is the Dunlop Jimi Hendrix which uses Silicone Transistors and the new Big Muff PI Germanium. That being said if you want a traditional fuzz sound I would go with the Fuzz Face (either or) and if you want a in your face wall of sound then I would get a RI NYC Big Muff Pi (Silicone) and not the Germanium Muff.
All muffs are silicon aside form the latest one. The IC one is well, an IC one, which uses silicon IC's.
They (FF & BMP) aren't going to sound different cause one is silicon and one is germanium, they sound different because they are totally different circuits and the polarity of the trannies has zero to do with it.
Almost anyone can make Ge sound like Si and vice versa.
The latest Si BMP, the 3003-C 2008 RI is easily the best big muff since the 3034 muff.