Hi duke11693,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Your 2 Official Scores show that you essentially performed the same each time (about 630 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. At face value, the 640/Q40 would probably be a bit better for your applications - but if you know the specific Programs that you plan to apply to, then you should be able to research those Programs in a bit more detail so that you get a better sense of how competitive this Score is.
If you're looking to continue studying - with the goal of scoring significantly higher - then it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your Goal Score?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich