I think for the Prizm 5.1 you can activate the Kylo's crossguard quilons in a delay (like in the movie), and I don't think the Nano Biscotti has that. For a Kylo saber, I'd go with the Prizm 5.5 though if that is available, because it has the unstable effect you might want to see in a Kylo Ren saber.