I tried both before settling on my PSS. I only had 1 SSG to test, and it did not impress me at all.
Cons: The stock reminded me of the POS that comes on the Savage rifles, I didn't like the Steyr scope rings that you are forced to use, recoil was much stiffer than a heavy .308 should be, bolt throw was slow and stiff, and to top it all off, this nearly new rifle would not shoot under 1" at 100m no matter what load I tried.
Pros: I liked the adjustable LOP using butt spacers, and the magazines were nice, set trigger was nice but not proper for a "tactical" rifle.
I tested 3 different 700's, two PSS .308's and a VS .308.
Cons: The PSS with detachable mag was not a reliable feeder, factory triggers were all in the 6lb+ range (but are easily adjustable to my preferred 2.5lb).
Pros: All three rifles shot less than 1" at 100m with loads they liked, two of them would shoot 1/3 MOA 3 shot groups all day long unless I screwed up, if something does go wrong parts are readily available.
I now own 2 PSS .308's and have never regretted my choice, they are dead stock rifles, other than adjusting the triggers and opening the barrel channel in the forend for 1/8" clearance all around. They will put Federal Gold Medal Match 168's into 1/2 MOA or better at 300m on demand.
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Cry "Havoc!" and let slip the dogs of war.