It probably depends alot on where your scores fall too. A 90%+ score on the LSAT and low GPA probably would trump a 3.5+ GPA and a lower LSAT. Although other factors like competitiveness of school, EC, Recs., and PS would come into play at that point. I think that is where the LSAT would come in stronger as it is the only thing that is standardized between the two applicants.
Of course this is an unprofessional opinion based on little, worth just about 2 cents.