I have played both gr and Socom, but i leane mor towards Socom. i got Socom II after all rather then gr. I almost did not get it due to i was a beta Tester for the online aspect of Socom II and the boots were pretty bad. But i was able to get my hand son teh demo of Socom II and yeah what a big improvment on the game. That's why i got Socom II. The online play is excellent.
Also on most of the servers you can find tactical games going on which imo beat out gr on the tactical aspect.
I say pick the game up if you have the money for it or even trade in gr
