I don't have a SOCOM-II and I can't see myself getting one. I've had a SOCOM-16 and have handled the SR-7.62.
I think these rifles are so close together as to run smack into NoSD problems, as this thread demonstrates. (
http://en.m.wikipedia.org/wiki/Narcissism_of_small_differences)
The performance of the Ruger and SOCOM-II are going to be indistinguishable in the real world. The SOCOM weighs ~10% more. The SOCOM has a tritium front sight but peeps are marginal in the dark. The SOCOM has a compensator vs. a flash suppressor but that won't change your follow-up shot speed.
Personally, I would not make that trade. You will lose a fair chunk of money for zero change in performance. On the other hand, something with a free floated 20+" barrel? That would at least be a meaningful change.