I'm in essentially the same situation (with a very similar system) and have found ways to tweak the settings to make it better. Fiddle around especially with things that require memory (i.e. the grass and textures) and see if you can get ok results with the computer. From my experience, the PC version at its lowest settings (if at an ok framerate) still looks a hair better than the PS3 one.
Playing on the go? Make sure your battery can handle it! (And make sure that the fan isn't prohibitively loud, haha)
Playing on the go? Make sure your battery can handle it! (And make sure that the fan isn't prohibitively loud, haha)
