Gen 1 razor is proven and only about $200 more generally speaking. Glass should be better on the Razor and tracking is proven. Any rings mounts you get will be specific to that scope as 30 & 34 are the standards. Who else uses 35mm?
The PST2 will likely be a very good high value scope like its predecessor. If you can, save up and get the Gen 2 Razor 4.5x
If not, consider the PST2, and see if it works for you. Resale will be good/easy. Can't say the same for the Gen1 Razor.
I'd guess the glass should be better on the G1Razor overall.