I just went from the V12s to PSS and there is no comparison, especially in grip. My car makes 470wtq and the V12s spin even with a 3rd gear roll-on. The PSS are like GLUE! Def worth it for me.
If you're not having major traction problems I'd get the v12s. For my setup in 19", the v12's were around $8xx and I got the PSS for $13xx OTD including tax and certs.