^ not better, just different. i use the psp mix saturator on snare, for example, while i prefer the decapitator on oh's.
the decapitator sounds smoother (and maybe a bit more "powerful"), imo, but they're both good.
I find the PSP to be more subtle, whereas the Decapitator is actually there to add grit/density. In the subtle arena nothing beats Nebula though, it totally owns both plug-ins.