Keep in mind all I say here is without knowing much about you, or your intended use of the rifle. I'm making assumptions based on what I would do with that gun, the limited choices you ask about, and on my assumption your intended use of the rifle being a lightweight hunting rifle.
So now for me, yes the Razor is worth the extra money, but only on one of my platforms, a dedicated long range gun I built that I never intend on lugging around hunting, at least not hiking with it. It tips the scales at 16 pounds all dressed out.
The benefits of each can be compared on the Vortex website, and then by you in one of the box stores that have both models.
I do own and shoot both of these optics. My PST is on a 300 win Mag Sendero platform, and although heavy, ill hunt with it.
It is my opinion it will not be worth it to you.
The gun you are going to buy is about a 6-7 pound gun. I would not advise putting a 3 pound scope on it. The Razor is built like a tank.
The PST is pretty heavy, too...
If it were me and I had your gun, I'd be looking to put a scope on it in the 22 oz range to keep weight down. Hopefully all this clarifies my point of view.
Those are just my thoughts on it.