There is absolutely no comparison between the pst and the NF, unless all you do is shoot on a well lit range for fun.
In low light the NF blows the pst away. For resolution (PID) the NF blows the pst away. For durability under sometimes unforseen circumstances the NF blows the pst away. And then there are all the things that F2S said.
A few friends and I have gone through right around 10 pst scopes. As in broken right around 10. Never tried to break a scope, never abused it. Just used it on the range. Never broke a NF.
I can't say this clearly enough, and I don't meant o sound rude at all. Anyone who thinks that a pst and a NF are at all similar, has never run a NF.