I don care for SM that much, althoguh ti is still pretty good. No limits is better in my opinion as it runs alot smoother, and it just seems liek the physics and things are more accurate. I also seem to get a better feeling of speed on nolimits. Although, SM is still very good. It has pretty good graphics and you can do alto with it. But IMO, its nothing on Nolimits. Although i will be getting SM2