I have used both, they are both good scopes. The PST has quite a few improvements that may or may not matter to you.
The main differences:
Std 30mm Viper / PST
Caps on Knobs / No Caps
6.5-20x / 4-24x
68 moa travel / 65 moa (higher magnification usually means less travel)
No sunshade / Sunshade Included
14.5" - 21.6 oz / 15.5" - 23 oz
3.1 to 3.3" eye relief / 4"+ eye relief
2nd focal plan reticle only / 1st or 2nd plane reticles
no illumination / illuminated reticle
no zero stop / zero stop (uses shims under the knobs)
The nice thing about the new PST reticles, they don't have mil dots in them.
The reticles they offer are a huge improvement over the out dated mil dot reticles from years ago. The FFP EBR-1 for example has 30 MOA of holdover from the center in 2 MOA increments. No useless mil dots to obscure the target. I can't remember one time I used the actual DOT to range anything, rather the spacing between them. Their thickness is a hindrance rather than a help for me.
As for optical quality, my understanding is they are the same glass as the non PST versions. The PST has more advanced coating on the glass.
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